NEET Physics Question - Wave Optics - Young's Double Slit Experiment

Assertion (A): If a glass slab is placed in front of one of the slits, then fringe width will decrease.

Reason (R): Glass slab will produce no path difference.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Placing a glass slab in front of one slit causes a path difference of \(t(\mu - 1)\) and shifts the entire fringe pattern but does not alter the fringe width \(\beta = \frac{\lambda D}{d}\). Thus, A is false. A glass slab indeed introduces an additional optical path difference. Thus, R is false.

Rankers Physics

Effect of Glass Slab in YDSE

Solution:

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