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## Homework Statement

Two perfectly flat glass plates are separated at one end by a piece of paper 0.065mm thick. A source of 585nm light illuminates the plates from above

How many bright bands appear to the observer?

Figure: (stars for positioning purposes)

*****eye

****| | | | | incidence light

----------------------glass

*************~~~~~~~~~~~paper

----------------------other piece of glass

## Homework Equations

I'm not certain about which equation to use which is my problem

It could be dsin(theta) = m(lambda)/N which is what I've been trying

or it could be dsin(theta) = m(lambda)

## The Attempt at a Solution

Here's what I tried

lamda = 585nm

d= .0065 mm

dsin(theta) = m(lambda)/N

(.0065mm)(sin 90 degrees) =585nm/ N

((.0065mm)(1))/585nm = 1/N

N= .09 which I'm pretty sure is wrong

Can anyone help me out on this one? :)

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