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Q.

Is it true that the speed of light is lower in two media, namely water and glass?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
The speed of light is lowest in two media, namely water and glass. Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium, and its value is more than 1 for an optically denser medium.
 
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