In the given diagram let r be the length of the line of propagation between the radiating and the incident surfaces. What is the value of solid angle W?

In the given diagram let r be the length of the line of propagation b

1.	In the given diagram let r be the length of the line of propagation between the radiating and the incident surfaces. What is the value of solid angle W?
A.	A sin α
B.	A cos α
C.	2A cos α
D.	2A cos α
Answer» C. 2A cos α

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In the given diagram let r be the length of the line of propagation between the radiating and the incident surfaces. What is the value of solid angle W?

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