A narrow slit of width 0.3 mm is illuminated normally by a parallel beam of light of wavelength a 6 x 10-'m. The Fraunhofer's diffraction pattern is obtained on a screen placed in the focal plane of a convex lens of focal length 25 cm. The lens is placed quite close to the slit. Find the width of central maximum on the screen.
Ans.1.0 mm.
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