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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

This question was posed to me at a job interview.

My doubt stems from Fresnel and Fraunhofer Diffraction in division Diffraction of Engineering Physics II

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The correct option is (b) Absent Spectra

The 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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