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MHT CET202521 Apr 2025Morning ShiftPhysicsRay OpticsActual

The phenomenon, which is not due to total internal reflection is

Options

  1. Amirage on hot summer days.
  2. Bbrilliance of diamond.
  3. Cdifference between apparent and real depth of a pond.
  4. Dworking of optical fibre.

Correct answer

C. difference between apparent and real depth of a pond.

Step-by-step solution

Total internal reflection occurs when light attempts to pass from a denser to a rarer medium at an angle exceeding the critical angle, i_c = ( n₂ n₁ ) for n₁ > n₂ . Mirage formation involves refraction and TIR; light from the sky reflects off hot, rarer air layers near the ground. Diamond brilliance results from multiple TIRs within the gem due to its high refractive index and low critical angle. Apparent depth arises solely from refraction at the water-air interface, governed by n_ water _ water = n_ air _ air , w

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