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  4. A small angle prism (μ = 1.62) gives a deviation of 4.8° . The angle of prism is

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Q. A small angle prism $(\mu = 1.62)$ gives a deviation of $4.8^{\circ}$ . The angle of prism is

Ray Optics and Optical Instruments

Solution:

Here, $\mu=1.62, \delta= 4.8^{\circ}$
$ \delta = \left(\mu-1\right)A$
or $A = \frac{\delta}{\left(\mu-1\right)} $
$= \frac{4.8}{\left(1.62-1\right)} = 7.74^{\circ}$