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________________?

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. 0.02×10-10m

D. 20×10-10m

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