COMEDK · Physics · 25. Ray Optics
An equilateral prism is kept in the minimum deviation position. If the angle of incidence of a monochromatic ray at a refracting face is \(49^{\circ} 30^{\prime}\), then the angle of minimum deviation of the ray will be
- A \(39^{\circ}\)
- B \(49^{\circ} 30^{\prime}\)
- C \(40^{\circ} 30^{\prime}\)
- D \(51^{\circ}\)
Answer & Solution
Correct Answer
(A) \(39^{\circ}\)
Step-by-step Solution
Detailed explanation
Given, \(i=49^{\circ} 30^{\prime}, A=60^{\circ}\) (equilateral prism) At minimum deviation position, angle of deviation is \(D=2 i-A=2\left(49^{\circ} 30^{\prime}\right)-60^{\circ}=99^{\circ}-60^{\circ}=39^{\circ}\)
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