The refracting angle of a prism is A , and refractive index of the material of the prism is cot A 2 . The…

The refracting angle of a prism is A , and refractive index of the material of the prism is cotA2. The angle of minimum deviation is
  1. 180o-3A
  2. 180o-2A
  3. 900-A
  4. 1800+2A

Solution

μ= sinδm+A2 sinA2
 μ=cotA2
cotA2= sinδm+A2sinA2
cosA2=sinδm+A2
π2-A2= δm+A2
δm=π-2A

Asked in: NEET 2015 (Phase 1)

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