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KCET2026PhysicsRay Optics

The critical angle for a monochromatic light going from medium A to medium B is . If the speed of light in medium A is V , then the speed of light in medium B is

Options

  1. AV(1 - )
  2. BV
  3. CV
  4. DV(1 - )

Correct answer

C. V

Step-by-step solution

Using Snell's law for the critical angle when light travels from medium A to medium B: _A = _B 90^ = _B _A Since the refractive index of a medium is inversely proportional to the speed of light in that medium, = c v _B _A = v_A v_B Given the speed of light in medium A is v_A = V = V v_B v_B = V Answer: V

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