PHYSICS Lecture Notes - Lecture 9: Refraction, Focal Length, Total Internal Reflection

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astrodabber

6 Mar 2023

School

Delhi Technological University

Department

Physics

Course

PHYSICS

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Document Summary

Coming to refraction, it is the bending of light when it enters another medium. For example, if light enters from air to water, it will bend. This happens due to the change in speed of light as it changes medium. Refraction is caused by the change in speed of light. At the boundary of 2 optical media, if there is a sudden change in the speed of light, it will cause the path of light to bend. The incident ray, the refracted ray and the normal lie in the same plane. For two particular media, the raio of sine of incident angle to the sine of refracted angle is a constant. i. e. sin i / sin r = constant. The refractive index of a medium is a ratio between the speed of light in air and the speed of light in a medium. Speed of light in air / speed of light in medium = n.

Related Questions

Light travels from a medium with a high refractive index to one with a low refractive index. Is the light bent away from or towards the normal line?

from what i learned i would assume that the light would be bent TOWARD the normal line correct? if im rright or wron please show me a sketch so i may visualize it better.

When light travels from a medium $where its speed is higher than the medium it enters$ , the refracted ray will bend toward the $Normal$ and the $angle of refraction$ $(θ_{r})$ will be smaller than the $angle of incidence$ $(θ_{i})$ . is this correct?

shagua

1. A light ray is incident on a reflecting surface. If the light ray makes a 25° angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

2. The light ray that makes the angle θ₁' is the refracted ray (true or false?)

3. True or False: The Law of Reflection can be used to show how an image appears behind a mirror and it can also be used to determine where the image will be located.

4. Snell's law is another name for the

law of dispersion
law of reflection
law of refraction

5. A light ray incident on a block of glass makes an incident angle of 50.0° with the normal to the surface. The refracted ray in the block makes an 26.8° with the normal. What is the index of refraction of the glass?

6. A light ray traveling from a higher index of refraction medium into a lower index of refraction medium (for example, from water into air) would bend away from the normal to the medium surface. When the refracted ray is parallel to the boundary of the medium, θ₂= 90°. The incident angle, θ₁, becomes θ_c, called the

cauchy angle
critical angle
conjugate angle
classic angle

pearchinchilla839

1)A light ray is incident on a reflecting surface. If the light ray makes a 25° angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

2)The light ray that makes the angle θ1' is the refracted ray (true or false?)

3)True or False: The Law of Reflection can be used to show how an image appears behind a mirror and it can also be used to determine where the image will be located.

4) Snell's law is another name for the

law of dispersion

law of reflection

law of refraction

5) A light ray incident on a block of glass makes an incident angle of 50.0° with the normal to the surface. The refracted ray in the block makes a 26.8° with the normal. What is the index of refraction of the glass?

A light ray traveling from a higher index of refraction medium into a lower index of refraction medium (for example, from water into the air) would bend away from the normal to the medium surface. When the refracted ray is parallel to the boundary of the medium, θ2= 90°. The incident angle, θ1, becomes θc, called the

viridianchinchilla179

PHYSICS Lecture Notes - Lecture 9: Refraction, Focal Length, Total Internal Reflection

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Physics: Principles with Applications

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