SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why is light refracted?
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Light speeds up
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Light slows down
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Light speed stays the same
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Light can either slow down or speed up
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Explanation:
Detailed explanation-1: -If light enters any substance with a higher refractive index (such as from air into glass) it slows down. The light bends towards the normal line. If light travels enters into a substance with a lower refractive index (such as from water into air) it speeds up.
Detailed explanation-2: -If a light ray slows down when it hits a substance, it bends towards the normal. The normal is the line that is perpendicular to the surface of the substance. If a light ray speeds up when it hits a substance, it moves away from the normal.
Detailed explanation-3: -Today we can verify that the index of refraction is related to the speed of light in a medium by measuring that speed directly.
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