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NDA 2 2025 GAT, question 69

Topic: Physics

Q69

Bottom of a tank containing water appears to be raised. It is due to

  1. (a) Reflection of light
  2. (b) Refraction of lightCorrect answer
  3. (c) Interference of light
  4. (d) Diffraction of light

Solution.

Answer: (b) Refraction of light

  1. Light bends away from the normal on travelling from water to air.
  2. The eye traces these rays back in straight lines to a shallower apparent position.
  3. This refraction makes the tank bottom appear raised.