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A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focussed by a convex lens on a screen placed in focal plane. The first minimum will be formed for the angle of diffraction equal to

(a) 0°

(b) 15°

(c) 30°

(d) 50°

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Correct option  (c) 30°


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