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(a) In Young's double slit experiment, describe briefly how bright and dark fringes obtained on the screen kept in front of a double slit. Hence obtain the expression for the fringe with. (b) The ratio of the intensities at minima in Young's double slit experiment is 9 :25. Find the ratio of the widths of the two slits. OR (a) Describe briefly how a diffractoin pattern is obtained on a screen due to a single narrow illuminated by a monchromatic source of light. Hence obtain the condition for the angular width of secondary maxima and secondary minima. (b) Two wavelengths of sodium light of 590 nm and 596 nm are used in turn to study the diffraction taking place at a single slit of aperture 2xx10^(-6). The distance between the positions of first maxima of the difraction pattern obtained in the two cases. |
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Answer» SOLUTION :(b) For first maxima `asintheta=(3)/(2)lambda` `y=(3lambdaD)/(2a)` for `590 NM` `y_(1)=0.66375m` for `596nm` `y_(2)=0.6705 m` `y_(2)-y_(1)=0.00675m` |
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