For a thin symmetric prism made of glass (refractive index 1.5), the ratio of incident angle and minimum deviation will be

Question

For a thin symmetric prism made of glass (refractive index 1.5), the ratio of incident angle and minimum deviation will be ______. [2026]

Smart Achievers · Accepted Answer

(2)

$δ_{m} = (μ - 1) A$

$\Rightarrow δ_{m} = (1.5 - 1) A \Rightarrow δ_{m} = \frac{A}{2}$

$Also, i = \frac{A + δ_{m}}{2} \Rightarrow i = \frac{A + \frac{A}{2}}{2} \Rightarrow i = \frac{3 A}{4}$

$Thus \frac{i}{δ_{m}} = \frac{3}{2}$

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