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### Refraction of Light, Part 1

• Speed of light in vacuum = c = 300,000,000 m/s.
• In a medium, the speed of light v is less than c. The quantity n = c/v is the index of refraction of the medium.
• Snell’s Law: n_1*sin(theta_1) = n_2*sin(theta_2). The law describes the bending of light as it travels from one medium into another.
• It is possible to derive Snell’s law from Fermat’s principle.

### Refraction of Light, Part 1

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Index of Refraction 0:31
• Speed of Light
• Speed of Light in Medium
• Index of Refraction of Medium
• Index of Refraction of Water
• Index of Refraction of Glass
• Snell's Law 8:09
• Light is Incident from One Medium to Another
• Light Bends Toward the Normal
• Example: Air/Water
• Light is Incident at Angle of 53 Degrees
• Water is more Optically Dense Than Air
• Apparent Depth 18:19
• Container of Water
• Penny at the Bottom
• Light Ray is Perpendicular to the Surface
• From Snell's Law
• Derivation of Snell's Law 32:38
• Idea of Wave Fronts
• Second Derivation of Snell's Law 48:17
• Same as Fermat's Principal
• Air and Water
• Extra Example 1: Light Hits Glass
• Extra Example 2: Find Theta
• Extra Example 3: Index of Refraction