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Wave Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
For question two statements are given-one labelled Assertion $(A) $ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below. Assertion $(A)$: Two point coherent sources of light $S_1$ and $S_2$ are placed on a line as shown. $ P$ and $Q$ are two points on that line. If at point $P$ maximum intensity is observed then maximum intensity should also be observed at $Q$.

Reason $(R)$: In the figure of assertion the distance $|S_1P - S_2P|$ is equal to distance $|S_2Q- S_1Q|.$
  • A
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
  • ✓
    Both $A$ and $R$ are true but $R $ is $\text{NOT}$ the correct explanation of $A$.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false and $R$ is also false.
✓

Answer

Correct option: B.
Both $A$ and $R$ are true but $R $ is $\text{NOT}$ the correct explanation of $A$.
Both $A$ and $R$ are true but $R$ is $\text{NOT}$ the correct explanation of $A$.
If maximum intensity is observed at $P$ then for maximum intensity to be also observed at $Q, S_1$ and $S_2$ must have phase difference of $2\text{ m}\pi \ ($where m is an integer$).$

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