Question
Monochromatic light entering from one medium to another, its wavelength changes but the frequency does not change, explain.
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Answer
When monochromatic light enters from one medium to another then the velocity $v$ of light changes. Since the source producing the wave remains the same, its frequency $v$ does not change. Therefore, the wavelength $\lambda$ changes on the basis of the formula $\lambda= v / v$.
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