If the nature of the transparent medium changes, the speed of light

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Changes

Remains constant

The speed of light does not depend on the medium

Cannot be predicted

answer is A.

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Detailed Solution

If the nature of the transparent medium changes, the speed of light changes.
When a transparent medium's properties change, the speed of light varies. When the light that is already moving at high speed enters a new transparent medium like air, water, or glass, its speed is slowed down in a manner that is proportional to the refractive index of the new substance. Like any wave, the characteristics of the medium affect the speed of a light wave. When an electromagnetic wave is present, its speed is determined by the material's optical density.

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