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A parallel beam of white light falls on a thin film whose refractive index is 1.33. IF angle of incedence is 52^(@) then thickness of the film for the reflected light to be coloured yel,ow (lambda = 6000 Å) most intensively must be : |
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Answer» `14(2N + 1) mu m` `therefore sin r = (sin i)/(mu) = 0.6` `therefore cos r = sqrt(1 - sin^(2) r )= 0.8` For CONSTRUCTIVE interference after reflection, `2 mu t cos r = (2n + 1) (lambda)/(2)` Solving `t = 0.14 (2n + 1)mu m`. |
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