We first arrange a laser so it shines on the disk and as it hits the grooves on the disk it causes diffraction. We measure the distance of the light difrracted from the middle to the point of first order maxima and the length from the light source to the wall where the light showing.
Since it causes constructive interference at the first maxima we used the formula
d*sin(theta) = m*lambda
and solve for d.
We see that the distance between grooves on a CD is about 1.5 micrometers.
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