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Question

If speed of light in air is 3×108m/s , the speed of light in glass (with refractive index 1.5) would be ________.

A
2×108m/s
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B
4.5×108m/s
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C
3×108m/s
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D
1.5×108m/s
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Solution

The correct option is A 2×108m/s
Refractive (μ) = speed of light in vacuumspeed of light in medium

speed of light in medium(glass) = 3×1081.5 = 2×108 m/s

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