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 Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is​
  • a)
    6.25 x 107 ms-1
  • b)
    4 x 108 ms-1
  • c)
    2 x 108 ms-1
  • d)
    5.5 x 1010 ms-1
Correct answer is option 'C'. Can you explain this answer?
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The speed of light in a medium depends on the refractive index of the medium. The refractive index is defined as the ratio of the speed of light in vacuum to the speed of light in the medium. In this case, the refractive index of the glass plate is given as 1.5.

Using the formula for refractive index:

Refractive index = Speed of light in vacuum / Speed of light in medium

We can rearrange the formula to solve for the speed of light in the medium:

Speed of light in medium = Speed of light in vacuum / Refractive index

Given that the refractive index is 1.5, we can substitute this value into the formula:

Speed of light in medium = Speed of light in vacuum / 1.5

The speed of light in vacuum is approximately 3 x 10^8 m/s. Substituting this value into the formula:

Speed of light in medium = (3 x 10^8 m/s) / 1.5

Simplifying the equation:

Speed of light in medium = 2 x 10^8 m/s

Therefore, the correct answer is option C) 2 x 10^8 m/s.
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Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is​a)6.25 x 107ms-1b)4 x 108ms-1c)2 x 108ms-1d)5.5 x 1010ms-1Correct answer is option 'C'. Can you explain this answer?
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