When light is refracted into a medium: 1. Its wavelength and freq… - Vidyadip

Question

When light is refracted into a medium:

Its wavelength and frequency both increase
Its wavelength increases but frequency remains unchanged
Its wavelength decreases but frequency remains unchanged.
Its wavelength and frequency both decrease.

✓

Answer

Its wavelength decreases but frequency remains unchanged.

Explanation:

Frequency of a light wave, as it travels from one medium to another, always remains unchanged, while wavelength decreases.

Decrease in the wavelength of light entering a medium of refractive index $\mu$, is given by,

$\lambda_\text{M}=\frac{\lambda}{\mu},$

Where $\lambda_\text{M}$ = wavelength in medium

$\lambda$ = wavelength in vacuum

$\mu$ = refractive index

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