Light of wavelength 645 nm is incident on a double slit. the angle between the central bright fringe and the second dark fringe is 4.90°. determine the separation d of the slits.

Slit separation,

Explanation:

It is given that,

Wavelength of light,

The angle between the central bright fringe and the second dark fringe,

In case of double slits, the condition for dark fringe is given by :

n = 2

So, the slit separation is . Hence, this is the required solution.