In Figure let a beam of x rays of wavelength 0.125 nm be incident on an NaCl crystal at angle θ = 45.0o to the top face of the crystal and a family of reflecting planes. Let the reflecting planes have separation d = 0.252 nm. The crystal is turned through angle Φ around an axis perpendicular to the plane of the page until these reflecting planes give diffraction maxima. What are the?

(a) Smaller and

(b) Larger value of Φ if the crystal is turned clockwise and the

(c) Smaller and

(d) Larger value of Φ if it is turned counter clockwise?

Transcribed Image Text:

Incident beam