When light is refracted into a medium: - Vidyadip

MCQ

When light is refracted into a medium:

A
Its wavelength and frequency both increase
B
Its wavelength increases but frequency remains unchanged
✓
Its wavelength decreases but frequency remains unchanged.
D
Its wavelength and frequency both decrease.

✓

Answer

Correct option: C.

Its wavelength decreases but frequency remains unchanged.

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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