What is the Number of Fringes in a YDSE with Given Parameters?

[Abhimessi10]

Homework Statement

Find number of fringes separated by 1 cm on a screen at a distance of 2mm from slits which are 0.2mm apart from each other.The wavelength of light used is 500nm.

Homework Equations

The Attempt at a Solution

I really don't know any way to solve it.I have tried putting unit values of slit distance wavelength and screen distance but I am not sure if that can be applied here

 

[Abhishek kumar]

Homework Statement

Find number of fringes separated by 1 cm on a screen at a distance of 2mm from slits which are 0.2mm apart from each other.The wavelength of light used is 500nm.

Homework Equations

The Attempt at a Solution

I really don't know any way to solve it.I have tried putting unit values of slit distance wavelength and screen distance but I am not sure if that can be applied here

First calculate fringe width for given arrangement

 

[Abhimessi10]

First calculate fringe width for given arrangement

Ok then?

 

[Abhishek kumar]

Ok then?

Then by dividing 1cm by fringe width you will get the number

 

[Abhimessi10]

Then by dividing 1cm by fringe width you will get the number

Between one cm there could be dark and bright fringes.So dividing 1 cm by fringe width will give only bright or dark fringes only,right?

 

[Abhishek kumar]

There is alternate bright and dark fringe of width Dλ/d.you will get both finge.

 

[Abhimessi10]

There is alternate bright and dark fringe of width Dλ/d.you will get both finge.

Yeah thanks man

 

[Abhishek kumar]

Yeah thanks man

You're Welcome