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how to find the no: of fringes????????????????pls explain

how to find the no: of fringes????????????????pls explain
 

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Grade:12th pass

1 Answers

suresh kumar
37 Points
2 years ago
as we know from the basic theory, the distance of screen from the slits is D, the point P is at a distance of y from the central maxima, Hence
y= nλD/d
and d is the sepearation between two slits
if the slita are moving apart with the realtive velocity of v
so the separation d is changing with time as v
d = vt
Hence, y= nλD/vt
rearrage them, we get n/t = yv/λD.
Hope it is clear.

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