Question

Light of wavelength 5000 Å propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the reflected and refracted light be affected?

Answer 1

wavelength is = 5000

frequency of reflected and refracted light is going to be the same .

therefore,

frequency,v=c/wavelength

=3×10 to the 8/5000×10 to the power minus10

frequency = 6×10 to the power 14hz

Answer 2

$\Large{\red{\underline{\underline{\sf{\pink{Solution:}}}}}}$

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$\hookrightarrow$ Wavelength of incident light, $\sf \lambda\:=\:5000\,Å\:=\:5000\times 10^{-10}m$

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$\hookrightarrow$ Speed of light, $\sf c\:=\:3\times 10^8ms^{-1}$

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Frequency of the incident light is given by the relation,

$\sf v\:=\: \dfrac{c}{\lambda}$

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$\sf v\:=\: \dfrac{3\times 10^8}{5000\times 10^{-10}}$

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$\sf \longrightarrow\,v\:=\:6\times 10^{14}Hz$

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$\hookrightarrow$ The wavelength and frequency of incident light is the same as that of reflected ray. Hence, the wavelength of reflected light is $\sf{\red{5000\,Å}}$ and its frequency is $\sf{\red{6\times 10^{14}Hz}}$