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What is the speed of light in glass?

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2.25 \times 1 0^{8} m / s

3 \times 1 0^{8} m / s

2 \times 1 0^{8} m / s

1 \times 1 0^{8} m / s

answer is C.

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Detailed Solution

The speed of light in glass is

2 \times 1 0^{8} m / s

Light travels at a speed of

2 \times 1 0^{8} m / s

in glass. The speed of light in a vacuum is almost the same as it is in air, that is 3×108 m/s. Its speed in water is

2.25 \times 1 0^{8} m / s

. When light travels from a rarer medium to a denser medium, the speed of light changes.

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