# Interference pattern, wavelength

## Homework Statement

Suppose the interference pattern shown in the figure is produced by monochromatic light passing through two slits, with a separation of 127 µm, and onto a screen 1.14 m away. What is the wavelength?

## Homework Equations

wavelength = (dsin$$\theta$$) / m
y=Ltan$$\theta$$

## The Attempt at a Solution

$$\theta$$= arctan (y/L) = arctan (.023 / 1.4) = .941
then plugged it in to get wavelenth. i used m = 2 for 2 slits
wavelenth = 127 x 10^-6m x sin .941 / 2

i think I have m wrong?