Question:

A prism of angle A = \(1^\circ\) has a refractive index \(\mu\) = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to \(\frac{N}{10}\).
Value of N is ____.

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For a thin prism the minimum deviation is (mu - 1)A.
Updated On: Nov 5, 2026
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Correct Answer: 5

Solution and Explanation

For a thin prism (small A), \(\delta_{min} \approx (\mu - 1)A\).
\(\delta_{min} = (1.5 - 1)\times 1^\circ = 0.5^\circ = \frac{5}{10}\).
Comparing with \(\frac{N}{10}\): N = 5.
Answer: 5
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