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Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light ? Refractive index of water is 1.33 . |
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Answer» Solution :Here wavelength of incident LIGHT in AIR `lamda=589nm=589xx10^(-9)m`, and speed of light in air `c=3xx10^(8)ms^(-1)` `therefore` Frequency of light `v=(c)/(lamda)=(3xx10^(8))/(589xx10^(-9))=5.09xx10^(14)HZ`. (a) Wavelength frequency and speed of reflected light are exactly same as that of incident light. (b) `because` REFRACTIVE index of water n=1.33 `therefore` Wavelength of refracted light `lamda.=(lamda)/(n)=(589nm)/(1.33)=444nm` Frequency of refracted light `v.=v=5.09xx10^(14)Hz`. and speed of refracted light `v=(c)/(n)=(3xx10^(8))/(1.33)=2.26xx10^(8)ms^(-1)` |
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