The velocity of light in water of refractive index  in ms−1 is

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OSSTET 2019 (Science PCM) Official Paper (Held on 22 Jan 2020)
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  1. 1.33 × 108
  2. 2.25 × 108
  3. 3 × 108
  4. 4 × 108

Answer (Detailed Solution Below)

Option 2 : 2.25 × 108
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Detailed Solution

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Concept:

Refractive Index (ηm):

The refractive index of a transparent material is defined as the ratio of the speed of light in the vacuum to that of a medium.

where, c = speed of light in vacuum, v = speed of light in the medium.

Calculation:

Given:

ηm = 4/3, c = 3 × 108 m/s.

v = 2.25 × 108 m/s.

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