What is the approximate speed of light in glass?

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A 2 × 10^8 m/s
B 3 × 10^8 m/s
C 2.5 × 10^8 m/s
D 1 × 10^8 m/s

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Answer: A. 2 × 10^8 m/s

Light travels at 3 × 10^8 m/s in vacuum. Glass has a refractive index of about 1.5, so light travels at about 3 × 10^8 / 1.5 = 2 × 10^8 m/s in glass.

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What is the approximate speed of light in glass?

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