In the adjacent diagram, CP represents a wavefront and AO & BP, the co – McqOptions

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1.	In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on q for constructive interference at P between the ray BP and reflected ray OP [IIT-JEE (Screening) 2003]
A.	cosq = 3l/2d
B.	cosq = l/4d
C.	secq ? cosq = l/d
D.	secq ? cosq = 4l/d
Answer» C. secq ? cosq = l/d

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