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The refractive index of a glass is 1.5. If the speed of light in vacuum is 3 x 10^8 m/s, its speed in the glass is

1958Medium DSSSB TGT Computer Science 0 replies 1 views
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The refractive index of a glass is 1.5. If the speed of light in vacuum is 3 x 10^8 m/s, its speed in the glass is

  • A2 x 10^8 m/s
  • B4.5 x 10^8 m/s
  • C1.5 x 10^8 m/s
  • D3 x 10^8 m/s
Correct answer: A

Explanation

v = c / n = (3 x 10^8) / 1.5 = 2 x 10^8 m/s.
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