InterviewSolution
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InterviewSolution
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Light of wavelength `5000Å` falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ? |
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Answer» wavelength of incident `Å = 5000 xx10^(-10)` m Speed of light `C=3xx10^(8)` m Freuency of incident light is given by the relation , `V=( C)/(lamda)` `=(3xx10^(8))/(5000xx10^(-10))=6xx10^(14)` Hz the wavelength and frequency of indent light is the same as that of refected ray. Hence the wavelrngth of reflected light is 5000 `Å` and its frequancy is `6xx10^(14)` Hz . When reflected , angle r is `90^(@)` Accoding to the law of reflection , the angle of incidence is alwayes equal to the angle of reflection , Hence we can write the sum as : angle i+ angle r =90 angle i + angle i =90 angle `=(90)/(2) = 45^(@)` therefore , the angle of incldence for the given consition is `45^(@)` |
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