A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal toA. (a) `0^@`B. (b) `15^@`C. (c) `30^@`D. (d) `60^@`

A parallel beam of monochromatic light of wavelength `5000Å` is incid

1.	A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal toA. (a) `0^@`B. (b) `15^@`C. (c) `30^@`D. (d) `60^@`
Answer» Correct Answer - C For the first minima `dsin theta=lambda` `impliessin theta=lambda/dimpliestheta=sin^-1((5000xx10^(-10))/(0.001xx10^-3))=30^@`

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