Laser light of wavelength lambda passes through a thin slit of width a and produces its first dark fringes at angles of +/- 30 degree with the original direction of the beam. the slit is then reduced in size to a circle of diameter a. when the same laser light is passed through the circle, the first dark fringe occurs at
a) +/- 66.9 degree.
b) +/- 45.0 degree.
c) +/- 37.6 degree.
d) +/- 36.6 degree.
e) +/- 15.0 degree.
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