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Geometrical Optics question

2017 · 8 Apr · Shift 1 · Q51
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Geometrical Optics question

2017 · 8 Apr · Shift 1 · Q51

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
Let the refractive index of a denser medium with respect to a rarer medium be n12 and its critical angle be θC . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90o. Angle A is given by :
  1. A
    1cos⁡−1(sin⁡θC){1 \over {{{\cos }^{ - 1}}\left( {\sin {\theta _C}} \right)}}cos−1(sinθC​)1​
  2. B
    1tan⁡−1(sin⁡θC){1 \over {{{\tan }^{ - 1}}\left( {\sin {\theta _C}} \right)}}tan−1(sinθC​)1​
  3. C
    cos⁡−1 (sin⁡θC){\cos ^{ - 1}}\,\left( {\sin {\theta _C}} \right)cos−1(sinθC​)
  4. D
    tan⁡−1 (sin⁡θC){\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)tan−1(sinθC​)
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