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  4. A this glass prism (μ=1.5) in the position of minimum deviation deviates the monochromatic light ray by 10°, the refracting angle of prism is

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Q. A this glass prism $(\mu=1.5)$ in the position of minimum deviation deviates the monochromatic light ray by $10^{\circ}$, the refracting angle of prism is

JIPMERJIPMER 2004

Solution:

Given : $\delta_{m}=10^{\circ}, \,\mu=1.5$
For a thin prism of minimum deviation
$\delta_{m} =(\mu-1) A$
$10^{\circ} =(1.5-1) A$ or $A =\frac{10}{0.5}=20^{\circ}$