Law of reflection and refraction pdf file

To locate an image, any two of these three rays can be chosen. Partially reflected bounces off surface partially transmitted through surface law of reflection angle of incidence angle of reflection. Refraction and snells law reading shen and kong ch. The light may be reflected back from the surface, transmitted through the material in which case it will deviate from its initial direction, a process known as refraction or absorbed by the material if. In the case of double refraction of a normally incident ray of light, at least one of the. A law describing the refraction of a ray of light at the surface between two media, such that the product of the refractive index of the first medium and. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation. State the laws of reflection and refraction, describe examples and apply the laws to simple. From te analysis from phase matching from fermats principle of least time total internal reflection and fibers fios. The incident ray, the normal to the surface and the reflected ray all lay on the same plane called the. A ray is equivalent to a very narrow beam of light, and it. Physics 1103 the laws of reflection and refraction name.

There are three laws which govern reflection and refraction. From fermats principle, one can derive a the law of reflection the angle of incidence is equal. Reflection and refraction lab mbusd internet usage. Ii the ratio of the sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. These laws of reflection are applicable to all types of reflecting surfaces including spherical surfaces. Law of refraction synonyms, law of refraction pronunciation, law of refraction translation, english dictionary definition of law of refraction. Fermats principle and the laws of reflection and refraction. Reflection and refraction tarleton state university. It is natural to treat the propagation of light in terms of rays. Cbse class 10 science chapter 10 light reflection and. Instructors are permitted to make and distribute copies for their classes.

Reflection and refraction when light hits a surface, one or more of three things may happen. The angle of reflection is formed between the reflected ray and the normal. Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. Notes physics module 6 reflection and refraction of light optics and optical instruments 190 zthe ray of light parallel to the principal axis, on reflection, passes through the focus. It is therefore easier to see diamonds in water than it is to see glass in air. An image is formed when the light rays coming from an object meet at a point after reflection from a mirror or refraction from lens. Refraction, snells law, and total internal reflection. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction. When polarized light encounters a dielectric interface, the polarization of the reflected and or refracted beams may be impacted. You can enjoy this soft file pdf in any era you expect. Please send us your suggestion about the show, then. Reflection, refraction, law, realapparent depth method, geometric optics. Here we use a mirror and a glass cuboid to demo the law of reflection and refraction of light.

Note the angle of incidence is formed between the incident ray and the normal. Using snells law, calculate the angle of refraction in the glass for incident angles of 0, 10, 20, 30, 40, 50, 60, 70 and 80 degrees. The law of refraction also states that the refracted ray is in the same plane as the incident ray. As expected from the law of reflection, the incident ray and the reflected ray both are at the same angle with respect to the normal. Using the law of reflection, explain how powder takes the shine off of a persons nose.

The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray. The physics classroom grants teachers and other users the right to print this pdf document and to download this pdf document for private use. Determination of the refractive index of a glass block. Results table 2 laser and refraction cell data incident. Outline te and tm fields refraction and snells law. Refraction, snells law, and total internal reflection 32098 relevant sections in the book. When we talk about the speed of light, were usually talking about the speed of light in a vacuum, which is 3. To minimize the time we set the derivative of the time with respect to x equal to zero. To register science tuitions on to clear your doubts. Reflection and refraction reflection and refraction are governed by two very simple laws. Determination of the refractive index of a glass block using law. Derive, recall and apply the relation between critical angle and refractive indices.

When you measure the law of reflection and the law of refraction, what is the advantage of making 2 measurements. Image formation due to refraction application of refraction 3. Snells law, where nr is the absolute refractive index of the medium in which the refracted ray travels second material, and ni is the absolute refractive index of the medium in which the incident ray travels. Snells law describes the relationship between the angles of the two light waves and the indices of refraction. Assume that the index of refraction of the acrylic is about 1. According to the law of reflection, the angle of incidence equals the angle of reflection. Students will be able to use the terms luminous and illuminated to label a variety of objects. 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. Just like the normal force, the normal line is drawn perpendicular to the surface. The purpose of this lab is to observe and understand the second law of reflection and snells law. This activity will allow students to experience the law of reflection for themselves, as well as connect the lesson to a realworld product.

Also, the first material has a socalled index of refraction n 1, and the second material has an index of refraction n 2. When light travels through something else, such as glass, diamond, or plastic, it travels at a different speed. Fermats principle and the laws of reflection and refraction fermats principle states that light travels between two points along the path that requires the least time, as compared to other nearby paths. Reflection and refraction equipment acrylic block set, planeconcaveconvex universal mirror, cork board, cork board stand, pins, flashlight, protractor, ruler, mirror worksheet, rectangular block worksheet, equilateral prism worksheet, converging lens worksheet. The law of refraction is simply the conservation of momentum its a collision at an angle. As with reflection, these angles are measured from the normal line to the surface. Reflection and refraction key points the ray model of light reflection and mirrors refraction, snells law. Angle of incident ray with normali equals reflected ray with normalr. Pdf vector formulations of the laws of reflection and. I was wondering if someone could please help me with this question. Snells law also known as snelldescartes law and the law of refraction is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. The law of reflection p p mirror or dielectric interface mit 2. With reflection, light waves bounces off a medium while with refraction, light waves enter the medium and change direction.

In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. F f 7 4 terms used in the study of spherical mirrors. A line drawn in the direction of propagation of light is called a ray of light. Reflection and refraction university of calgary in alberta. The refracted part of the light enters the glass with an angle. The amount of light reflected or refracted depends on the angle at which you are looking relative to the surface. Rays of light parallel to the principal axis after reflection from a convex mirror get diverged and appear to come from a point behind the mirror. For the smallest possible incident angle of 0 the refracted ray is also at 0. Reflection and refraction lab page 3 seeing reflection and refraction at the same time both refraction and reflection often occur when light hits a boundary between materials such as the boundary between glass and air. Reflection is the change in the direction of a wave on a surface that allows it to return to its original medium or in the same line. Derivation of the laws of reflection and refraction. Phy pack 4 refractive index law 2 produced by physics group, university of cape coast, as part of a delphe funded project title. If the index of refraction for a certain glass is 1.

Light reflection and refraction notes for class 10. Law of refraction definition of law of refraction by the. Even it is in conventional area as the additional do, you can log on the autograph. Refractive index snells law group experiment lesson 5 3. State the laws of reflection and refraction, describe examples and apply the laws to simple examples involving plane boundaries. Vector formulations of the laws of reflection and refraction of forward and backward waves. For water and diamond, which has a refractive index of 2. We also use the definition of the sine as opposite side over hypotenuse to relate the lengths to the angles of incidence and reflection. Light reflection and refraction notes for class 10 formulas download pdf. Reflection and refraction wave fronts spherical waves are solutions to maxwells equations molecules scatter spherical waves spherical waves can add up to plane waves reflection and refraction from surfaces snells law mirages and prisms. We consider a light wave travelling through medium 1 and striking medium 2. The incident light is now scattered backwards without cancellation, this is reflection. When light falls on a highly polished surface like a mirror most of the light is sent back into the same medium.