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4. a) A plane wave of wavelength 600 nm falls on a long narrow slit of width 0.6 mm. (i) Calculate the angles of diffraction for the first two minima. (ii) How are these angles influenced if the width of slit is changed to 0.2 mm? (iii) If a convex lens of focal length 0.2 m is now placed after the slit, calculate the separation between the second minima on either side of the central maximum. (10) 4 b) For the arrangement described in 4(a) above, repeat the calculations for the first two maxima on either side of the central maximum. (5) c) Use Fresnel construction to discuss diffraction pattern produced by a circular opaque disc.
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