First slide

Prism

Question

A prism of angle A = 1º has a refractive index $μ = 1.5$ . A good estimate for the minimum angle of deviation (in degrees) is close to N/10. Value of N is_____

Easy

Solution

Deviation for small angled prism $δ = (μ - 1) A$
$\begin{array}{l} \Rightarrow δ = (1.5 - 1) 1 = 0.5 ° = \frac{5}{10} \\ \Rightarrow N = 5 \end{array}$

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