A Crystal Is Irradiated with X-Rays with a Wavelength Of 0.120

A crystal is irradiated with x-rays with a wavelength of $0.120 \mathrm {~nm}$ . The atomic planes in the crystal are separated by $0.21 \mathrm {~nm}$ . At what angles of incidence with respect to the normal will the $x$ -rays reflect from the crystal?

A) only $73 ^ { \circ }$
B) only $55 ^ { \circ }$
C) $73 ^ { \circ } , 55 ^ { \circ } , 31 ^ { \circ }$
D) only $73 ^ { \circ }$ and $31 ^ { \circ }$

Correct Answer:

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