In a Young’s double slit experiment, the slit separation is `0.2 cm`, the distance between the screen and slit is 1 m . Wavelength of the light used is `5000 Å`. The distance between two consecutive dark fringes (in mm ) is

Options

A. 0.25
B. 0.26
C. 0.27
D. 0.28

Answer

A

Explanation

`beta= (lambdaD)/(d)` [distance between two consecutive dark fringes]
`implies beta= (5000 xx 10^(-10) xx 1)/(0.2 xx 10^(-2))= 0.25 mm`