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PhysicsNEET 2022Total internal reflection and prisms

Ray Optics and Optical Instruments

Two transparent media A and B are separated by a plane boundary. The speeds of light in those media are 1.5×1081.5 \times 10^{8} m/s and 2.0×1082.0 \times 10^{8} m/s, respectively. The critical angle for a ray of light for these two media is:

  1. A.tan⁡−1(0.750)\tan^{-1}(0.750)
  2. B.sin⁡−1(0.500)\sin^{-1}(0.500)
  3. C.sin⁡−1(0.750)\sin^{-1}(0.750)✓
  4. D.tan⁡−1(0.500)\tan^{-1}(0.500)

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