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## Homework Statement

Monochromatic light falls into slit 3.00*10^-6 wide. The angle between the first dark fringes on either side of the cental maximum is 25 derees. Calculate the λ.

w=3.00*10^-6 m

ө=25˚

## Homework Equations

sin(ө) = nλ/w

sin(ө) = ((m+0.5)λ)/w

Δy=λL/w

## The Attempt at a Solution

sinө=λ/w

λ=sin25*3.0*10^-6

=1.3*10^-6 m

hoever the answer is 6.49*10^-7