Electromagnetic waves of wavelength 0.178nm fall on a crystal surface. As the angle of incidence is gradually increased, starting at 0 degrees, you find that the first strong interference maximum occurs when the beam makes an angle of 23.0 degrees with the surface of the crystal planes in the Bragg reflection.
a) What is the distance between the crystal planes?
d=_______nm
b) At what other angles will interference maxima occur?