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Question

How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced by a red light?


A
It increases
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B
It decreases
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C
It remains the same
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D
None of these
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Solution

The correct option is B It decreases
$$\mu=\dfrac{\sin(\dfrac{A+D}{2})}{\sin(\dfrac{A}{2})}$$
Maximum deviation $$D \alpha \mu$$; $$\mu \rightarrow$$ Refractive index
Refractive index for red is least while for violet is maximum.
Therefore minimum deviation of glass prism is decreased when red light is used.

Physics

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