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What is the resultant image formed for very fine grains in the Laue back reflection method?

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What is the resultant image formed for very fine grains in the Laue back reflection method?

(a) Few clear spots

(b) Large number of spots

(c) Continuous rings

(d) Irregular spots

I have been asked this question during an online exam.

My question comes from Diffraction in chapter Solid Solutions & Crystallography of Engineering Material & Metallurgy

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Best answer
The correct option is (c) Continuous rings

The best explanation: X-ray diffraction is a technique used for probing the state of a crystal structure. Laue back reflection method is used for single crystals or polycrystalline masses. In this method, for very fine grains of 0.0004 mm show a back reflection photograph of continuous rings which are doubly resolved.

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