Question

Why plane transmissiongrafting is not used in diffractionof xrays?

Answer 1

X-rays are electromagnetic waves of much shorter wavelength of order of 0.5 to 10 angstrom. Mostly, lines ruled on plane diffraction grating contains 6 x 10^5 lines per meter .since X-rays have much shorter wavelength they easily pass through space between the lines. Thus,in order to diffract X-rays,grating with much finer rulings,having distance between rulings comparable to the wavelength of X-rays are required which is impossible to construct. Hence, crystal diffraction grating is used.