A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
Wavelength of X-rays is very small \[(\approx {\AA})\]. Hence they are not diffracted by means of ordinary grating. X-rays follows the Bragg?s law.
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