Answer to Question #86877 in Optics for Navdha

Question

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.

Answer 1

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