In refraction, when light enters a denser medium and slows down, what happens to the wavelength?

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Multiple Choice

In refraction, when light enters a denser medium and slows down, what happens to the wavelength?

Explanation:
The key idea is that wavelength in a medium depends on the light’s speed there, while frequency stays the same when light crosses a boundary. When light enters a denser medium, its speed decreases but the frequency remains unchanged. Since wavelength λ = v/f and f is constant, the slower speed means a shorter wavelength. So the wavelength decreases. (In a less dense medium, the speed and thus the wavelength would increase.)

The key idea is that wavelength in a medium depends on the light’s speed there, while frequency stays the same when light crosses a boundary. When light enters a denser medium, its speed decreases but the frequency remains unchanged. Since wavelength λ = v/f and f is constant, the slower speed means a shorter wavelength. So the wavelength decreases. (In a less dense medium, the speed and thus the wavelength would increase.)

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