Assertion : `X` - rays cannot be diffracted by means of grating .
Reason : `X` - rays does not obey Bragg's law.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer

C

Explanation

Wavelength of `X` - rays is very small `(~~ Å)`. Hence they are not diffracted by means of ordinary grating. `X` - rays follow the Bragg's law.