Entry Test MCQ :: Physical Optics

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Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is

[A].	4 x 10-10 m	[B].	2 x 10-10 m
[C].	0.02x10-10m	[D].	20x10-10m

Answer: Option B