A light wave travelling in a transparent homogeneous medium enters another transparent homogeneous medium of higher refractive index. The speed of light in the second medium ________.

is less than that in the first medium.

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is more than that in the first medium.

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is the same as that in the first medium.

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may be more or less than that in the first medium depending on the angle of incidence.

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Solution

The correct option is A is less than that in the first medium.
When a light travels from a rarer medium (less refractive index) to denser medium (higher refractive index), its speed decreases and vice-versa. Hence, speed of light in second medium is less than that in first medium.

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