At a different angle θ', the waves scattered from two successive planes interfere (nearly) destructively. The overall wave nature of the incident and reflected waves are shown in Figure 2.12.

Figure 2.12: Wave nature of the incident and reflected waves.

Reference:
[1]. B. D. Cullity , Elements of X-ray diffraction Addison-Wesley Publishing company, Inc., USA (1956).

Quiz 2:
(Q2.1). What are the basic conditions required for diffraction? Does the condition vary with the sources?

(Q2.2). What is the typical range of X-ray wavelength?

(Q2.3). Is X-ray with higher wavelength or lower wavelength good for materials characterization? Why?