In a double slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite to one of the slits, its order is

Options

A. `(d^(2))/(lamdaD)`
B. `(d^(2))/(2lamdaD)`
C. `(d^(2))/(4lamdaD)`
D. `(d^(2))/(3lamdaD)`

Answer

B

Explanation

`x_(n)=(nlamdaD)/(d)` given that `d/2=x_(n)`
`therefore (d)/(2)=(nlamdaD)/(d)" "therefore n=(d^(2))/(2lamdaD)`