# Double slit - find wavelength

## Homework Statement

The following data was obtained via the double slit experiment:

angle to the eighth maximum = 1.12 degrees
distance from slits to screen = 302cm = 3.02m
distance from first to fifth mimum = 2.95cm
distance between slits = 0.00025m

find the wavelength.

## Homework Equations

supposed to use this equation to find wavelength:

xn/L=(n-0.5)($\lambda$/d)
or
xm/L=(m)($\lambda$/d)

## The Attempt at a Solution

problem is, there's no given value for xm or xn

how can i get this value?

(oh, and i specifically have to use the equation listed above)

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