| The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index μ is put in front of one of the slits, the central maximum gest shifted by a distance equal to n fringe widths. If the wavelength of light used is \[\lambda ,t\]will be : [JEE Main 9-4-2019 Morning] |
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A) \[\frac{2D\lambda }{a(\mu -1)}\]
B) \[\frac{D\lambda }{a(\mu -1)}\]
C) \[\frac{2nD\lambda }{a(\mu -1)}\]
D) \[\frac{nD\lambda }{a(\mu -1)}\]
Correct Answer: D
Solution :
[d] Path difference at central maxima  whole pattern will shift by same amount which will be given by |
 according to the question  |
| no option is matching, therefore question should be awarded bonus. |
 Correct Option should be (Bonus) |
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