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					 The X-rays cannot be diffracted by means of an ordinary grating because of
 
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- high speed
 - short wavelength
 - large wavelength
 - none of these
 
 
Correct Option: B
We know that the X-rays are of short wavelength as compared to grating constant of optical grating. As a result of this, it makes difficult to observe X-rays diffraction with ordinary grating.