The figure represents two identical slits in a Young’s double slit experiment. The width of each slit is b and distance between the centres of the two slits is d. Consider a point P on the screen that is close to centre of the screen. `Delta x_(t)` represents the optical path difference to point P from the top edges of the two slits and `Delta x_(b)` represents the optical path difference to P from the bottom edges of the two slits. Find` Delta x_(b) – Delta x_(t)`. It is given that `D gtgt d.`

The figure represents two identical slits in a Young’s double slit e

1.	The figure represents two identical slits in a Young’s double slit experiment. The width of each slit is b and distance between the centres of the two slits is d. Consider a point P on the screen that is close to centre of the screen. `Delta x_(t)` represents the optical path difference to point P from the top edges of the two slits and `Delta x_(b)` represents the optical path difference to P from the bottom edges of the two slits. Find` Delta x_(b) – Delta x_(t)`. It is given that `D gtgt d.`
Answer» Correct Answer - `(db)/(D)`

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