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A plane wavefront (wavelength=lambda) is...

A plane wavefront (wavelength`=lambda`) is falling on `YDSE` apparatus as shown in the figure. The lower half of it is filled with water (refractive index `=1.5`). How many maximas can be theoretically obtained on the screen if `d=98 lambda` and `D=20000 lambda` (including the maxima at infinity)

A

`245`

B

`246`

C

`122`

D

`123`

Text Solution

Verified by Experts

The correct Answer is:
b
Maximum path difference `=(49lambda)/(lambda)+(49lambda)/(lambda//1.5)=122.5` wavelengths
Number of maxima `=245`
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