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

A. 20∘
B. 15∘
C. 30∘
D. 50∘

Sagot :

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