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The refracting angle of a prism is A and the refractive index is cot (A//2). The angle of minimum deviation is : |
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Answer» `180^(@) - 2A` Given `"" mu = cot (A)/(2)` `therefore cot""(A)/(2)=sin(A+(delta_(m))/(2))/(sin((A)/(2)))` `rArr "" COS((A)/(2))=sin((A+delta_(m))/(2))` `rArrsin(90^(@)-(A)/(2))=sin""((A+delta_(m))/(2))` `rArr "" 90^(@)-(A)/(2)=(A+delta_(m))/(2)` `sin = 180^(@) - 2A`. |
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