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. $${\text{h}} < \frac{\lambda }{8}\cos \theta $$
Answer: Option C
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