Light waves travel from an optically rarer me | vedclass

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(A) The correct answer is $A$. The velocity of a wave is given by the relation $v = 
u \lambda$,where $
u$ is the frequency and $\lambda$ is the wav

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wavelength

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(A) The correct answer is $A$. The velocity of a wave is given by the relation $v = 
u \lambda$,where $
u$ is the frequency and $\lambda$ is the wavelength. When light travels from one medium to another,its frequency $
u$ remains constant because it depends on the source of the light. Since $v = 
u \lambda$ and $
u$ is constant,the velocity $v$ is directly proportional to the wavelength $\lambda$ $(v \propto \lambda)$. Therefore,when the velocity of light decreases upon entering a denser medium,the wavelength must also decrease.

Light waves travel from an optically rarer medium to an optically denser medium. Its velocity decreases because of a change in . . . . . . .

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