What is single slit diffraction using concave lens .And what is a triple wavefront
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single slit diffraction deals with constructive and destructive interference of wavefronts emminating from infinite (assumed)points btwn two slits .
Normally the experiment is done using a convex lens but cancave lenses can also be used all it does is diverge the way rather than converge .
In fact of triple wavefront it's nothing but the superposition of 3 wavefronts at the same instant but that's only for higher classes definitely not part of IITJEE.
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