A diffraction grating used at normal incidence gives a line ` lamda_(1)=600Å` in a certain order
Channel: Doubtnut
Date: 2021-11-08

A diffraction grating used at normal incidence gives a line ` lamda_(1)=600Å` in a certain order supermposed on another line ` lamda_(2)=450Å` of the next higher order. If the angle of diffraction is `30^(@)` how many lines are there in 1 cm of the grating.