GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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slightly slower than 300 000 000 m/s
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slightly faster than 300 000 000 m/s
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so much slower than 300 000 000 m/s
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so much faster than 300 000 000 m/s.
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Detailed explanation-1: -Answer: Solution : A medium is rarer when the speed of light increases when light travels through that medium. Speed of light in air is more than speed of light in glass, which means air is optically rarer than glass.
Detailed explanation-2: -Light travels at approximately 300, 000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225, 000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200, 000 kilometers per second in glass (refractive index of 1.5).
Detailed explanation-3: -So, we can say that air is optically rare than glass. The reason for this distinction is due to the velocity of light being higher in the air than it is in water. The reason for the velocity of light being higher in the air than in glass is due to air having a lower refractive index than glass.