A lens of focal length `1m` forms Fraunhofer diffraction pattern of a single slit of width `0.04 cm`
Channel: Doubtnut
Date: 2020-08-16

A lens of focal length `1m` forms Fraunhofer diffraction pattern of a single slit of width `0.04 cm` in its focal plane. The incident light contains two wavwlength `lambda_(1)` and `lambda_(2)`. It is found that the fourth minimum crresponding to `lambda_(1)` and the fifth minimum corresponding to `lambda_(2)` occur at the same point `0.5 cm` from the central maximum. Compute `lambda_(1)` and `lambda_(2)`