- #1
jssamp
- 31
- 3
Homework Statement
A light ray is incident on a flat piece of glass with index of refraction n. Show that if the incident angle θ is small, the emerging ray is displaced a distance d = tθ(n - 1)/n form the incident ray, where t is the thickness of the glass and θ is in radians.
Homework Equations
n1sinθ1 = n2sinθ2
The Attempt at a Solution
Using Snell's law, right triangles, sin(a-b) identity, and small angle approximation, I have got it to:
d = tθ(n-(cosθ/cosθR))/n [θR is angle of refraction in glass]
how do I get cosθ/cosθR = 1?
Last edited: