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Q.

What is the speed of light in glass?


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a

2.25×108m/s

b

3×108 m/s

c

2×108 m/s

d

1×108 m/s  

answer is C.

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Detailed Solution

The speed of light in glass is 2×108 m/s
Light travels at a speed of 2×108 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 2.25×108 m/s. When light travels from a rarer medium to a denser medium, the speed of light changes.
 
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