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  4. Deviation of 5° is observed from a prism whose angle is small and whose refractive index is 1.5 . The angle of prism is

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Q. Deviation of $5^{\circ}$ is observed from a prism whose angle is small and whose refractive index is $1.5 .$ The angle of prism is

Ray Optics and Optical Instruments

Solution:

According to the relation
$\delta=(\mu-1) A $
$\Rightarrow 5=(\mu-1) A$
$5=(1.5-1) A$
$A=10^{\circ}$