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Chapter 35: Q. 20 (page 1017)

A sheet of glass has nred=1.52 and nviolet=1.55. A narrow beam of white light is incident on the glass at 30°. What is the angular spread of the light inside the glass?

Short Answer

Expert verified

The angular spread of the light inside the glass is0.39°.

Step by step solution

01

Given Information.

We have given the refractive indexnred=1.52andnviolet=1.55.

We need to find the angular spread of light inside the glass.

02

Diagram

03

Calculation.

n1sinσ1=nRsinσR

σR=sin-1(n1sinσ1nR)=19.20

n1=1.00

σ1=30

nR=1.52

σV=sin-1(n1sinσ1nV)=18.82cw

n1=1.00

σ1=30

nV=1.55

σ=σR+σV=19.20°-18.82°=0.385°

Here nis the refractive index and σis the refractive angle.

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