# Fringe with of interference pattern

## Homework Statement

Calculate the fringe width of an interference pattern created by two coherent source, 1mm apart and emitting light of wavelength 600 nm. the pattern is observed on a screen 50cm from the source

x = dλ/a

## The Attempt at a Solution

I don't know how to start...

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Hootenanny
Staff Emeritus
Gold Member
Well you must have some idea since you know the equation.

λ = wavelength, can you tell me what does x, d and a represent.

Hootenanny
Staff Emeritus
Gold Member
λ = wavelength, can you tell me what does x, d and a represent.
x represents the width of the fringe, d represents the distance between the slits and the screen; and a represents the slit separation. Surely you have a textbook and/or class notes?

Thanks Hootenanny... I think I got it...

d = 50cm , a = 1mm , λ = 600nm

d = 50*10^-2m
a = 1*10^-3m
λ = 600*10^-9m

= (600*10^-9*50*10^-2)/(1*10^-3)
= 3*10^-4m

Hootenanny
Staff Emeritus