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Wave Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
Question
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.
  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is NOT the correct explanation of A.
  3. A is true but R is false.
  4. A is false and R is also false.
Assertion (A): Two point coherent sources of light S1 and S2 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 |S1P - S2P| is equal to distance |S2Q- S1Q|.
✓

Answer

  1. Both A and R are true but R is NOT the correct explanation of A.

Explanation:

If maximum intensity is observed at P then for maximum intensity to be also observed at Q, S1 and S2 must have phase difference of $2\text{ m}\pi$ (where m is an integer).

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