- #1

- 8

- 1

## Homework Statement

In an investigation into single-slit diffraction, a laser is used to produce an interference pattern on a screen. With the following information determine the wavelength of the light in 3 different ways.

· The angle to the third dark fringe is 2.6˚.

· The distance from the slits to the screen is 3.00 m.

· The distance from the center of the central maximum to the second dark fringe is 9.0740 cm.

· The distance from the first maximum to the third maximum is 9.072 cm.

· The width of the slit is 0.0500 mm.

## Homework Equations

I know it is a single slit problem therefore:

sintheta=(n)(wavelength)/(w)

y/L=(n)(wavelength)/(w)

Don't know the 3rd

## The Attempt at a Solution

Sin(theta)=n(wavelength)/w

Sin(theta)(w)/n=wavelength

Wavelength=(sin2.6)(5.0x10^-5)/3

Wavelength=7.56x10^-7m

y/L=(n)(wavelength)/w

wavelength=wy/nL

wavelength=(5.0x10^-5)(0.09074)/2(3)

wavelength=7.56x10^-7m

I don't know the 3rd equation

Thanks for the help