Light waves travel from optically rarer medium to optically denser medium. Its velocity decreases because of change in _____

frequency

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wavelength

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amplitude

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phase

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Solution

The correct option is B wavelength
When a light wave travels from rarer medium to denser medium, its frequency remains the same but its wavelength decreases.
Velocity of light waves decreases because of change in wavelength.
Correct answer is option B.

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