Physics-
General
Easy
Question
A beam of light has a small wavelength spread 
about a central wavelength 
. The beam travels in vaccum until it enters a glass plate at an angle 
relative to the normal to the plate, as shown in figure. The index of refraction of the glass is given by n(). The angular spread dq' of the refracted beam is given by
= 1 n δ λ 
= d n ( λ ) d λ δ λ 
= tan θ ' n d n ( λ ) d λ δ λ 
= sin θ sin θ ' δ λ λ
The correct answer is:
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