The refractive index of glass is 1.5. The speed of light in air is 3 × 10⁸ m/s. What will be the speed of light in the glass?
Answer: 2 × 10⁸ m/s
Explanation
The refractive index (n) is defined as:
n = Speed of light in air / Speed of light in medium
Given:
n = 1.5
Speed of light in air = 3 × 10⁸ m/s
Rearrange the formula to solve for Speed of light in glass:
Speed of light in glass = Speed of light in air / n
= (3 × 10⁸ m/s) / 1.5
= 2 × 10⁸ m/s
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