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JEE PHYSICS MCQ: WAVE OPTICS

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Understanding +4 | -1

For Bragg's diffraction by a crystal to occur, then the

{X} /

ray of wavelength

\lambda

and interatomic distance

d

must be

View answer and explanation

Correct option: C

\lambda

is smaller than or equal to

2 d

Option C (

\lambda

is smaller than or equal to

2 d

) is correct because Bragg's law requires that

n\lambda = 2d\sin\theta

, and

\sin\theta

can be at most 1.

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