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Q.

The speed of light is maximum when it travels through


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a

Glass

b

Water

c

Air

d

Vacuum 

answer is D.

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Detailed Solution

The speed of light is maximum when it travels through Vacuum.
Compared to other media, light moves through a vacuum more quickly. This is because a vacuum has the lowest refractive index of all materials or unity and because there is no matter to hinder the transmission of light in a vacuum. The speed of light is, therefore, greatest in a vacuum. Note: Vacuum and air always have the highest speeds of light Since air has a refractive index of one.
  
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