Here ∠r=30∘ 
(Using law of triangle) ⇒μ=sinrsini⇒2⋅sin30∘=sini⇒sini=21⇒i=45∘
The refractive index of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surface of the prism is made a mirror…
NEET UG 2004 — Physics Optics
2004mcqhard
The refractive index of the material of a prism is 2 and its refracting angle is 30∘. One of the refracting surface of the prism is made a mirror inward. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:
Official previous-year question
Held on 30 Apr 2004 · Verified 9 Jul 2026.
Options
- A
45∘
- B
60∘
- C
0
- D
30∘
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