The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length 1m. The width of the slit is 0.3 mm. if the third minimum is formed at a distance of 5 mm from the central maximum then calculate the wavelength of light.

Explanation

`X_(n)=(nflamda)/(a)implieslamda=(aX_(n))/(fn)=(3xx10^(-4)xx5xx10^(-3))/(3xx1)=5000Å" "[becausen=3]`