Light reflection and refraction class 10 notes vidyakul. This is a simple simulation showing the reflection and refraction of a ray of light as it attempts to move from one medium to another. Intensity of each wavelength specified by amplitude visible light. Oct 16, 2017 physics notes for competitive exams optics. Reflection and refraction of light o level mini physics. Well also learn about laws of reflections, types of mirrors and a fun experiment at the end. The light is refracted both as it enters and as it leaves the drop. We shall try to understand in this chapter the reflection of light by spherical mirrors. If the electric field of a light beam is vibrating in a fixed plane in. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. P physics pdf reflection of light on plane surface1. In this lesson, you will explore a new phenomenon that light. A ray is a thin beam of light that travels in a straight line. If an ocean wave approaches a beach obliquely, the part of the wave farther from the beach will move faster.
Some of the so called white light from the sun bounces off grass to become green light. Prism and rainbow formation are the examples of refraction of light. Maupertuis hoped that the principle might unify the laws of physics and support his proof of the existence of god. Diffusedirregular reflection is a nonmirrorlike reflection of light. Light deals with luminous energy, energy which causes the sensation of vision. This is called specular reflection but with children we just call it mirror reflection figure 2a and 3a. A ray of light from the top of the chess piece reflects from the mirror. When a light ray strikes a surface separating two media with different optical properties, part of the light energy is reflected back to the media where it coming from. Students will find it easy to get all the parts of this chapter within a single video. Mar 04, 2020 reflection, abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums. Introduction as you are about to make your decision of what elective subjects to study in the next three years, the physics teacher is going to provide you a solid experience of what physics lessons will be in our school. Bending light snells law refraction reflection phet. The results of this experiment suggest that light colored and shiny surfaces reflect light best. Selina solutions for class 9 physics chapter 7 reflection of light.
Refection of light involves some fundamental terms such as incident ray, point of incidence, reflected ray, normal, angle of incidence, angle of reflection, plane of incidence, plane of. Use a light source, threeway mirror, rhombus prism, and protractor to measure angles of a light ray. Reflection involves a change in direction of the light. Colours of objects can be explained by supposing that their surfaces reflect different proportions of the various frequency or wavelength components of the incident light. The reflectivity of a surface material is the fraction of energy of the oncoming wave that is reflected by it. Physics refraction of light through a prism prism is a triangular glass, which has two triangular bases and three rectangular lateral surfaces as shown in the image given below. Snells law and refraction principles are used to explain a variety of realworld phenomena. Minutephysics a britannica publishing partner see all videos for this article. Since reflective surfaces such as mirrors are very good at preserving the intensity of light in a reflection, a single source of light can be reflected multiple times. Explore bending of light between two media with different indices of refraction.
In this lab, you will study reflection of light from different mirrors. This multiple reflection is possible until the intensity of light becomes low until the point that we cannot see. Tippens, professor of physics southern polytechnic state university a powerpoint presentation by. Jan 19, 2020 this topic covers reflection and refraction of light of o level physics. Light light was considered as mysterious thing in olden days. Chapter 7 reflection of light icse selina solutions for. An opensource web application to simulate reflection and refraction of light. The learner is presented with the position of five students allan, bill, callie, del and ellie and a plane mirror and challenged to identify which students allan or. Mirrors and lenses discuss what happens when the direction of a ray of light is changed by a mirror or a lens.
Since the light ray appears to be broken, the phenomenon is known as refraction. Our physics lessons adopt flippped classroom teaching strategy. Do you think the same thing can happen with light as well. When light falls on a surface, following may happen. Note that do not move the arm until the program is started to take the actual data run. Through this program, you have a number of course options to fulfill a ge requirement andor needed physics coursework required for your major.
The law of reflection states that, on reflection from a smooth surface, the angle of the. Electromagnetic waves are the only type of wave that do not require a medium at all. The scattered light goes off in many different directions, and may be scattered again and again before it is finally absorbed. Planet earth has high reflectivity because much of it is covered by snow, ice, sand, and water. To the eye, the ray seems to come from behind the mirror. Color and light not in textbook sad but true cse486, penn state robert collins physics of light and color light is electromagnetic radiation different colors correspond to different wavelengths. Light bounces in a particular way, and it bends in a. Advanced placement physics waves and optics energy. Refraction is where light bends when it moves from one medium to another. The principal axis of the mirror is a straight line drawn through the center of curvature c and the midpoint of the mirror. Reflection is where light bounces off a shiny, reflective surface. It occurs in different areas of nature, namely light, waves, signal scattering, sonar reflection, so on and so forth. The physics of light described and captioned media program. The simple wave simulator interactive provides the learner with a virtual wave machine for exploring the nature of a wave, quantitative relationships between wavelength, frequency and speed, and comparisons between transverse waves such as those traveling through a rope and longitudinal waves such as sound.
However, in this unit we will learn the particle characteristics of the light. Rainbows are produced by a combination of refraction and reflection. Waves must travel in a medium with one important exception. Total internal reflection if the angle of incidence is larger than this, no transmission occurs. When light propagates in a transparent material medium, its speed is in general less than the speed in vacuum c. A highly polished surface, such as a mirror, reflects most of the light falling on it. An interesting consequence of this is that a light ray will change direction when passing from one medium to another. Optics optic is one of the branch of physics which deals with the light and properties of it. Some of the topics will be covered in this unit are. In physics, reflection is defined as the change in the direction of a wavefront at the interface between two different media, bouncing the wavefront back into the original medium. Reflection when a ray of light strikes a plane mirror, the light ray reflects off the mirror.
On the other hand, when we shine the light of a laser pen on paper, the light spot can be seen from all directions figure 3b. Physics refraction of light through a prism tutorialspoint. Reflection of light is the abrupt change in the direction of propagation of light rays that strike the boundary between different mediums. Selina solutions class 9 concise physics chapter 7 reflection. The angle of incidence is equal to the angle of reflection, and the incident ray, the reflected ray and the normal to the mirror.
This allows to construct an instrument capable of transforming. The bouncing back of rays of light from a polished and shiny surface is called reflection or reflection of light. Equivalent to american high school diploma subtopics. Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. See how changing from air to water to glass changes the bending angle. Reflection this area of physics is frequently considered to be easy and straightforward, this is because. It is natural to treat the propagation of light in terms of rays. Reflection paper i took this physics class because it is a prerequisite for a program that i would like to do. You may have noticed that you see a rainbow only when you look away from the sun.
All the familiar optical phenomena, such as straight line propagation, reflection and refraction could be explained by that corpuscular hypothesis. The reflectivity of a surface material is the fraction of energy of the oncoming wave that is. Students use an optics light source, optics track, and half screen to measure the image and object distances associated with the real image formed by a concave spherical mirror and then use principles of reflection and the spherical mirror equation to determine the mirrors radius of curvature. A line drawn in the direction of propagation of light is called a ray of light. Mcq questions for class 10 science light reflection and. Free pdf download of cbse class 10 science chapter 10 light reflection and refraction multiple choice questions with answers. Mcq questions for class 10 science with answers was prepared based on latest exam pattern. Light is a wave phenomenon with its electric field or its magnetic field vibrating in time and in space. The amount of reflected and transmitted light is different for the two different incident. Pdf reflection, refraction and transmission of light in. Somehow light must also carry information about the location and shape of the objects that we see. Refraction of light is the change in direction bending of light rays when it passes from one optically transparent medium to another. Mar 12, 2019 in physics, reflection is defined as the change in the direction of a wavefront at the interface between two different media, bouncing the wavefront back into the original medium.
These include propagation, reflection, and refraction. Light reflection and refraction class 10 numericals. This scattering is caused by the interaction of light with small particles, even atoms or molecules, within the material. Some of it bounces off, some of it goes through, and the rest of it is absorbed. The ray nature of light is used to explain how light refracts at planar and curved surfaces. Reflection and refraction vi radiation propagating from inside a dielectric to air can suffer the phenomenon of total internal reflection. All the solutions of reflection of light physics explained in detail by experts to help students prepare for their icse exams. Mirror, mirror on the wall eight lessons on mirrors. Reflection, refraction, polarization, and diffraction discuss specific properties of light, and the equations that relate these properties. Light enters a drop of water and is reflected from the back of the drop.
Common examples are reflection of light, as shown in figure 21, as well. Learn more about the same in light reflection and refraction class 10 notes pdf. Ap physics 2 refraction problem this is a simulation based on a problem on the publicly released 2015 ap physics 2 exam. A single image is formed when an object is placed in front of a mirror. In other subjects, you learn in lessons and do homework at home. We discuss the different cases of refraction of light in detail. Reflection, refraction, and dispersion boundless physics. The law of reflection is illustrated in figure 1, which also shows how the angles are measured relative to the perpendicular to the surface at the point where the light ray strikes. A basic simulation showing refraction and reflection of a light ray. Light is brightness that comes from an object producing light, called luminous body sun. The sensation of vision is stimulated through optic nerve.
P c normal c pole central axis p i r fig14a fig14b r downloaded from. Something must be vibrating oscillating in order to create a wave. For example, waves in deep water travel faster than in shallow. When light travels from a denser to a rarer medium and from a rarer to a denser material. Here, the incident ray which is reflected along with reflected ray doesnt have the same angle to the normal as the incident ray. When light travels from one medium to another like air to glass, or glass to water, it does three things. As shown below, an electromagnetic wave is a transverse wave consisting of mutually perpendicular oscillating electric and magnetic fields. Laws of reflection i angle of incidence is equal to the angle of reflection. This topic covers reflection and refraction of light of o level physics. In figure 3a we caught this reflection on a piece of paper. Spherical mirror reflection advanced placement lab. Light reflection and refraction notes for class 10. This program introduces the topic of light as a wave, and explores the properties of light using the wave model. Light is a form of energy emitted by set of luminous body and travels along the straight line.
I really didnt expect to enjoy this class or to learn anything new because i had taken an advanced physics class in high school. Electromagnetic waves are ultimately produced by an accelerating charge. Thus the tool is fit for use, especially for physics learning material of smk and students at the same level in general. Shown is a hemispherical view of a sound wave emitted by a pulsating sphere. According to classical theory of reflection of light, light always travels the least action path. Chapter 10 light reflection and refraction notes download in pdf which has explanation of light reflection and refraction, light reflection and refraction class 10, light reflection and refraction class 10 notes, reflection and refraction of light. The basics of reflection, some interesting problems. In this chapter i am going to deal solely with specular reflection, the law of specular reflection being that the angle of reflection is equal to the angle of incidence. Figure 1 shows an example of reflection from a plane surface such as mirror.
Reflection, refraction, diffraction, polarization, interference, dispersion and scattering of light are 7 basic properties of light for kids in physics. Notes of ch 10 light reflection class 10th science. As we began to learn the materials in this class it became very apparent that physics are everywhere. Illustrate graphically the reflection of light from plane, convex, and concave concave mirrors. A ray of light is light from a single point source normally represented by a long and straight arrow on diagrams. The results of this experiment suggest that darkcolored parts of the earth, such as forests and greencrop land, would have lower. Consider a sound wave since it is easier to visualize. Considers the reflection of light from both smooth and rough surfaces and contains practice problems on the law of reflection. The reflection and refraction of light 72799 rays and wave fronts. Reflection and refraction 17 be scattered away from its original direction figure 2. P physics pdf reflection of light on plane surface1 slideshare. In the process the character of the light may be changed. White light holograms often appear a little blurry with rainbow edges, because the diffraction patterns of various colors of light are at slightly different locations due to their different wavelengths.
There is an angle of incidence for which the angle of refraction will be 90. Icse selina solutions for class 9 physics icse, 7 reflection of light. Reflection of light is a vast topic covered in class 9 textbook under chapter 7. At least part of the oncoming wave disturbance remains in the same medium. Thus, when it hits a smooth surface, angle of incidence is always equal to angle of reflection.
When light passes from one medium to another, the angles of incidence and refraction, and the two refractive indices are related by the familiar snells law. Common examples include the reflection of light, sound and water waves. You will be required to take some course work in physics if you major in, for example, biology, chemistry, many prehealth fields, engineering, mathematics, or computer science. Reflection reflection is basically the phenomenon due to which a light ray reverses its direction on striking a different optical medium. Reflected ray is a ray of light reflected from a surface. Refraction of light is the change in direction of a light ray when it travels from one medium to another. To understand the terms reflection and refraction of all waves when we look in a mirror, why is it that the image we see is as we expect. These laws of reflection are applicable to all types of reflecting surfaces. Each point of an illuminated object emits a continuum of light rays in a range of directions. A group of rays of light emitted by a source of light is called a beam of light. The nature of light as a wave a small disturbance in an electric field creates a small magnetic field, which in turn creates a small electric field, and so on light propagates itself by its bootstraps. A ray is equivalent to a very narrow beam of light, and it.
Reflection, abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums. Cause of refraction is change in speed of light while entering a different medium. A ray of light is the straight line along which the light traveled and a bundle of light rays is called a beam of light. Because none of the rays actually emanate from the image, it is called a virtual image. If light passes into a medium with a smaller index of refraction, the angle of refraction is larger. To register science tuitions on to clear your doubts. Interactive is a skillbuilding tool that allows the learner to explore images in plane mirrors. Cbse class 10 science chapter 10 light reflection and. Light, reflection, and color characteristics of light light is an electromagnetic wave.
Light reflection and refraction 161 let us recall these laws i the angle of incidence is equal to the angle of reflection, and ii the incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane. We know that light shows both the particle and wave characteristics. Light is a very complex phenomenon, but in many situations its behavior can be understood with a simple model based on rays and wave fronts. Normal is an imaginary line perpendicular to a surface where the reflection. In such a type of reflection rays of light that hit an irregular object with a rough surface, are reflected back and scatter in all directions. We expect to see reflections from smooth surfaces, but figure 2 illustrates how a rough surface reflects light. When you throw a ball at a wall, it bounces back to you. We normally assume that a thing is located in the direction where the light comes from. When light hits a multilayer planar stack, it is reflected, refracted, and absorbed in.
Students can solve ncert class 10 science light reflection and refraction multiple choice questions with answers to know their preparation level. Different mixes of these components produce the different visual sensations that we call colour. Color discusses properties of visible light and how we perceive it. It is similar to bouncing back of a football after colliding with a wall or any hard surface. Jan 20, 2020 holograms that are viewed with reflected light, such as the white light holograms on credit cards, are reflection holograms and are more common. Reflection and refraction key points the ray model of light reflection and mirrors refraction, snells law total internal reflection. Light waves can interfere with other light waves, canceling or amplifying them. In such reflection a dephasing occurs between the parallel and perpendicular components of the incident electric field. When light strikes a perfectly reflecting surface, such a mirror for example, all the light. A common example of reflection is reflected light from a mirror or a still pool of water, but reflection affects other types of waves beside light. The law of reflection applies, just as it does for a plane mirror, i. Light reflection and refraction notes for class 10 formulas download pdf. Chapter 34a reflection and mirrors geometrical a powerpoint presentation by paul e.