# UW-Madison PHYSICS 109 - Refraction and Total internal reflection (3 pages)

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## Refraction and Total internal reflection

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## Refraction and Total internal reflection

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Lecture notes 2 and information for chapter 2 reading

Lecture number:
2
Pages:
3
Type:
Lecture Note
School:
Course:
Physics 109 - Physics in the Arts
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Physics 109 1st Edition Lecture 2 Outline of Last Lecture I Light and Color II Reflection a Specular Reflection b Diffuse Reflection III Reflection from a mirror Outline of Current Lecture I Refraction of Light a Snell s law II Total Internal Reflection III Refraction Examples Current Lecture IV Refraction of Light a When light penetrates into a denser medium the rays are kinked toward the normal air to water This kinking is called refraction b When light penetrates into a less dense medium the rays are kinked away from the normal water to air c The behavior in a medium depends on the index of refraction of the medium n i The denser the medium the higher the index of refraction d Snell s law shows how the angle in air and the water are related i Sin angle air sin angle water n air n water These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute V Total Internal Reflection a No light is refracted all light is reflected from the interface b Total internal reflection TIR is the phenomenon that involves the reflection of all the incident light off the boundary TIR only takes place when both of the following two conditions are met i the light is in the more dense medium and approaching the less dense medium ii the angle of incidence is greater than the so called critical angle c We can calculate the critical angle by using Snell s Law The critical angle in air is 90 degrees Since we know that the index of refraction for air 1 and the sin90 1 we can find the critical angle by using Critical angle water inverse sin 1 n water VI Refraction Examples a Does the fish appear above or below its real position The fish appears to be above its actual position because of refraction b If angle air 30 degrees what is angle water n water 1 33 Angle w inverse sin 1 1 33 sin 30 5 1 33 22 degrees Note sin 30 5

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