Question

A Plane Wave front of light of wavelength SSOORU.
is incident on two slits in a screen perpendicular to
the divertion of light says. It toto I separation of to
bright fringes on a screen
screen 2 m away
is arm find
the distance between the slits​

Answer 1

Answer:

Location of bright fringes is given by 

xn=nλD/b

where

n: nth bright fringe, λ: wavelength, D: distance between slits and screen, b: slit width

Fringe width(β) is equal to the separation between two consecutive bright(or dark) fringes.

β=λD/b.(i)

Angular fringe width θ is the angle subtended by a fringe width at the slits.

∴θ=β/D.(ii)

From (i) and (ii),

θ=λ/b