Unpolarized light passes through two polarizers whose transmission axes are at a

Question

Unpolarized light passes through two polarizers whose transmission axes are at an angle of 27. 2degree with respect to each other. What fraction of the incident intensity is transmitted through the polarizers? Light travels a distance of 0. 880 m in 3. 80 ns in a given substance. What is the index of refraction of this substance? Light enters a container of liquid at an angle of 47degree to the normal; the refracted beam makes an angle of 31degree with the normal. Calculate the index of refraction of this liquid. White light is incident on a soap film (n = 1. 33) in air. The reflected light looks bluish because the red light (lambda = 660 nm) is absent in the reflection. What is the minimum thickness of the soap film? nm

Explanation / Answer

7)

n = 1.33

lambda = 660nm

by using the formula

2 * n * t = k * lambda

2 * 1.33 * t = 1 * 660 * 10^-9

t = 1 * 660 * 10^-9 / 2.66 = 248.12 * 10^-9

t = 248.12 nm

6)

Using snell's law.

n1sin(O1)=n2sin(O2)

sin(47)=n2sin(31)

n2=1.419

4)

I=Iocos^2(O)

Using malus law we have that

I=Iocos^2(27.2)

I=0.791Io

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