Why is angular width taken lamda/a while calculating frensel distance – InterviewSolution

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1.	Why is angular width taken lamda/a while calculating frensel distance ,but angular width of central maxima is 2lamda/a for single slit diffraction?
Answer» Why is angular width taken lamda/a while calculating frensel distance ,but angular width of central maxima is 2lamda/a for single slit diffraction?

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