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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Here, `lambda =5000 Å = 5 xx 10^(-7) m` `v = (c )/(lambda) = (3 xx 10^(8))/(5 xx 10^(-7)) = 6 xx 10^(14)hertz`. On reflection, there is no change in wavelength or frequency. Therefore, `lambda' = lambda = 5000 Å , v' = v = 6 xx 10^(14) Hz`. For reflected ray to be normal to incident ray, `i + r = 90^(@)` or `i + i = 90^(@)` (`because` r = i) `:. i = 90//2 = 45^(@)`
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