refraction2

# refraction2 - 1 Refraction the Snell law Light in geometric...

This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Refraction, the Snell law Light in geometric optics is discussed in rays and represented by a straight line with an arrow indicating the propagation direction. Light propagates in straight lines in homogenous medium. Light reflects on interface of two media, following the law of reflection: Light also refracts on the interface of two media, following Snell’s law of refraction: i r θ θ = Incident light Normal of the interface Reflected light θ 1 and θ 2 are both with respect to the normal of the interface. The parameters n 1 and n 2 are call the index of medium 1 and 2 respectively. 2 2 1 1 sin in θ θ n s n = Medium 1 Medium 2 θ 1 θ 2 2 Refraction, the index of refraction of a medium Light travels with the speed of light c in vacuum with c = 3.00×10 8 m/sec . Light travels with a speed v in a transparent medium with v is always smaller than the c . The ratio of c to v is called the index of the refraction n of that medium and is weak function the light frequency. We will get to the frequency dependence part later. And it is this light speed difference in two different media that makes light a turn at the interface of the two media. Have you ever driven a tractor on belts or a tank? You turn Have you ever driven a tractor on belts or a tank?...
View Full Document

## This note was uploaded on 05/06/2008 for the course PHYS 1304 taught by Professor Ye during the Spring '08 term at SMU.

### Page1 / 11

refraction2 - 1 Refraction the Snell law Light in geometric...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online