Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).
A
$${\text{h}} > \frac{\lambda }{\Delta }\cos \theta $$
B
$${\text{h}} = \frac{\lambda }{8}\cos \theta $$
C
$${\text{h}} > \frac{\lambda }{8}\cos \theta $$
D
$${\text{h}}
Correct Answer: $${\text{h}} > \frac{\lambda }{8}\cos \theta $$
