The angle of minimum deviation by prism is . Its critical angle will b

1.	The angle of minimum deviation by prism is . Its critical angle will be
Answer» `sin^-1 (TAN""A/2)` `sin^-1 (COT ""A/2)` `cos^-1 (cot""A/2)` `cos^-1 (tan""A/2)` ANSWER :A

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