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NDA 1 2025 GAT, question 144

Topic: Physics

Q144

When a light ray passes through from air to water with a non-zero angle the ray will be

  1. (a) bending towards the normalCorrect answer
  2. (b) bending away from the normal
  3. (c) propagating in straight line
  4. (d) reflected towards the opposite direction

Solution.

Answer: (a) bending towards the normal

  1. Water has a larger refractive index than air.
  2. Snell’s law, nairsin⁡i=nwatersin⁡rn_{air}\sin i = n_{water}\sin r, therefore gives r<ir < i for non-zero incidence: the transmitted ray bends towards the normal.