Question

In figure, $CP$ represents a wavefront and $AO$ and $BP$, the corresponding two rays. Find the condition on $\theta$ for constructive interference at P between the ray BP and reflected ray $OP$.

• A. $\cos \theta =\frac{3\lambda }{2d}$
• B. $\cos \theta =\frac{\lambda }{4d}$
• C. $\sec \theta -\cos \theta =\frac{\lambda }{d}$
• D. $\sec \theta -\cos \theta =\frac{4\lambda }{2d}$

Answer 1

The correct option is D $\sec \theta -\cos \theta =\frac{4\lambda }{2d}$

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