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**1. In a Young's double-slit experiment, the seventh dark fringe is located 0.029 m to the side of the central bright finge on a flat screen, which is 1.1 m away from the slits. The separation between the slits is 1.5 x 10^-4 m. What is the wavelength of the light being used?**

**2. wavelength = d sin(theta)**

Tan theta = y/x

y= 0.029m

x= 1.1m

d = 1.5 x 10^-4 m

Tan theta = y/x

y= 0.029m

x= 1.1m

d = 1.5 x 10^-4 m

**3. Tan Theta = y/x = 0.029/1.1= 0.0264**

Theta = 1.51

Wavelength = d sin (theta) = (1.5 x 10^-4) x 0.0264

Wavelength = 3.95 x 10^-6

Theta = 1.51

Wavelength = d sin (theta) = (1.5 x 10^-4) x 0.0264

Wavelength = 3.95 x 10^-6

This is not correct and I can't seem to place why.

Any thoughts?