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  • A ray of light is incident on a face of equilateral triangle at an incident angle 50. At this angle minimum deviation occurs. This deviation isOption: 1

A ray of light is incident on a face of equilateral triangle at an incident angle 50. At this angle minimum deviation occurs. This deviation is

Option: 1

30


Option: 2

40


Option: 3

50


Option: 4

None of these


Answers (1)

best_answer

\mathrm{A=60^{\circ} }
At minimum deviation: \mathrm{ \mathrm{i}=\mathrm{e}=50^{\circ} }
Also,  \mathrm{ r_1=r_2=\frac{A}{2}=30^{\circ} }

\mathrm{\delta_{\min }=\mathrm{i}+\mathrm{e}-\mathrm{A}=100^{\circ}-60^{\circ}=40^{\circ} }.
 

Posted by

Divya Prakash Singh

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