Source of light and the screen appear to be at infinite distance from the slit
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B
The wavefront’s involved in this case are plane
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C
Convex lenses are used to focus the diffraction fringes on the screen
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D
All the above
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Solution
The correct option is D All the above Yup, all are correct. Lenses are used on either side of the slit to mimic infinitely far source and screen, and to give planar wavefronts