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
B
It decreases
C
It remains the same
D
None of these

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 indexRefractive 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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