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Question
When light is refracted into a medium, ______________ .
Options
its wavelength and frequency increase
its wavelength increases but frequency remains unchanged
its wavelength decreases but frequency remains unchanged
its wavelength and frequency decrease
Solution
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
\[\lambda_M = \frac{\lambda}{\mu}, \]
\[\text{where }\lambda_M = \text{wavelength in medium}\]
\[\lambda = \text{wavelength in vacuum}\]
\[\mu = \text{refractive index}\]
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