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PhysicsNEET 2020Total internal reflection and prisms

Ray Optics and Optical Instruments

A ray is incident at an angle of incidence ii on one surface of a small-angle prism (with angle of prism AA) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ\mu, then the angle of incidence is nearly equal to:

  1. A.A2μ\dfrac{A}{2\mu}
  2. B.2Aμ\dfrac{2A}{\mu}
  3. C.μA\mu A✓
  4. D.μA2\dfrac{\mu A}{2}

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