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For the formula lambda = (ax)/D, I want to know does x represents the distance from the central fringe to the first fringe (taking it as an example) or would it be the distance from the first fringe to the first fringe on the other side.

I hope you know what i mean.

Thanks.

I hope you know what i mean.

Thanks.

dpd5

the formula i learned was lamda = ws/D

where w is the width between the centre of one fringe and the centre of the next

and s is the distance between the two slits

hope this helps...

where w is the width between the centre of one fringe and the centre of the next

and s is the distance between the two slits

hope this helps...

oh ok thanks but i never seen the formula you learned though. Does that mean w is from the centre to the first order (n=1)?

Original post by aura1947

Basically the formula is:

x = λD/a

Where; x = fringe spacing i.e. the width of each dark/bright fringe.

D = distance between the double slits and the screen

a = distance between the two slits.

x = λD/a

Where; x = fringe spacing i.e. the width of each dark/bright fringe.

D = distance between the double slits and the screen

a = distance between the two slits.

just to avoid marks being lost, a = spacing between slits (from their centres)

I'll close this one.

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