When a light wave travels from air to glass.

Its wavelength decreases

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Its wavelength increases

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There is no change in wavelength

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Its frequency decreases

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Solution

The correct option is A Its wavelength decreases
we know that $C = f λ$ where $C$ is the speed of light wave, $f$ is frequency of light wave and $λ$ is wavelength of light wave . Frequency of the light wave remains constant in any medium so when light wave goes rarer to denser medium, it's speed decreases hence the wavelength of the wave also decreases.

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