Download Physics 422 - Spring 2015 - Assignment #5

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Transcript
Physics 422 - Spring 2015 - Assignment #5
Due Wednesday, April 1st
1. Use Fermat’s principle to derive the law of reflection,
sin θ1 = sin θ2 ,
using the geometry shown below and the requirement that the optical path
length between points A and B be stationary with respect to x.
d
A
B
y
θ1
θ2
x
d−x
2. Use Fermat’s principle to derive the law of refraction,
n1 sin θ1 = n2 sin θ2 ,
using the geometry shown below and the requirement that the optical path
length between points A and B be stationary with respect to x.
d
A
y
n1
θ1
d−x
x
θ2
n2
B
3. (a) Calculate the distance to the object focal point, fo , and the image
focal point fi for a single spherical concave refracting surface with radius of
curvature R = −10 cm, made of a material with index of refraction n2 = 1.5,
and with air (n1 = 1) on the object side.
(b) Calculate fo and fi for the case where the air is replaced with water
(n1 = 1.33).
4. Two positive thin lenses with focal lenghts f1 and f2 are placed a distance
d = f1 + f2 apart. If light of intensity I0 is incident on the system along
the optical axis from very far away, ie., so → ∞, what is the intensity of the
light emerging from the second lens?