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Wave Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
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 $OP$
  • A
    $\cos q  = 3l/2d$
  • ✓
    $\cos q = l/4d$
  • C
    $\sec q – \cos q = l/d$
  • D
    $\sec q – \cos q = 4l/d$
✓

Answer

Correct option: B.
$\cos q = l/4d$
$\cos q = l/4d$

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