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A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5, the wavelength of refracted light will be

1. dependent on intensity of refracted light
2. same
3. smaller
4. larger

Correct answer: smaller

Solution

When light enters a medium with a refractive index greater than 1, its speed decreases, and consequently, its wavelength becomes smaller. The frequency remains unchanged.

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