Young’s Double Slit Fringe Width – Rankers Physics
Topic: Wave Optics
Subtopic: Young's Double Slit Experiment

Young’s Double Slit Fringe Width

Assertion (A): In case of Young double slit experiment width of all fringes were equal.
Reason (R): Angular width of fringes were equal.
 
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

In Young's Double Slit Experiment (YDSE), the fringe width \(beta = \frac{\lambda D}{d}\) is constant for all fringes, hence they are of equal width. The angular fringe width \(\theta = \frac{\lambda}{d}\) is also constant. Reason (R) correctly explains Assertion (A).

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