Question: 19. In Fraunhoffer diffraction by a narrow slit, a screen is placed at a distance of 2 m from the lens to obtain the diffraction

$19. In Fraunhoffer diffraction by a narrow slit, a screen is$

the diffraction pattern. If the slit width is 0.2 mm andthe first

minimum is 5 mm on either side of the central maximum, find

19. In Fraunhoffer diffraction by a narrow slit, a screen is placed at a distance of 2 m from the lens to obtain the diffraction pattern. If the slit width is 0.2 mm andthe first minimum is 5 mm on either side of the central maximum, find the wavelength of light. [Ans: 5000 A]

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