When light is refracted into a medium,

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Its wavelength increases but frequency remains unchanged

Its wavelength and frequency both increase

Its wavelength and frequency both decrease

Its wavelength decreases but frequency remains unchanged

answer is B.

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Detailed Solution

According to Snell’s law $\frac{\sin i}{\sin r} = \frac{v_{1}}{v_{2}} = \frac{μ_{2}}{μ_{1}}$

From fig. we see that

$r > i \Rightarrow v_{2} > v_{1} f r o m S n e l l' s L a w S o v_{2} = n λ_{2} > v_{1} = n λ_{1} \Rightarrow λ_{2} > λ_{1}$

(Frequency of wave does not change on refraction)

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