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MHT CET Physics question

PhysicsWave OpticsMHT CET

A lens having focal length f gives Fraunhoffer type diffraction pattern of a slit having width a. If wavelength of light is , the distance of first dark band and next bright band from axis is given by

Answer: (B)

Solution

The first minimum of single-slit diffraction satisfies , so its distance from the axis on the focal plane is ;

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Question ID VK-077277