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In Double Slit Fraunhofer Diffraction, some orders of interference pattern are missing. It is called _____

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In Double Slit Fraunhofer Diffraction, some orders of interference pattern are missing. It is called _____

(a) Missing Spectra

(b) Absent Spectra

(c) End Spectra

(d) Emission Spectra

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My enquiry is from Fraunhofer Diffraction topic in division Optics of Engineering Physics II

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The correct choice is (b) Absent Spectra

Easy explanation: In Double Slit Fraunhofer Diffraction, there are certain angles where the interference maxima and Diffraction minima overlap. These orders of interference pattern are missing in the pattern. It is known as Absent Spectra.

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