Radiation of atomic hydrogen falls normally on a diffraction grating width `l= 6.6 mm`.
Channel: Doubtnut
Date: 2020-08-23

Radiation of atomic hydrogen falls normally on a diffraction grating width `l= 6.6 mm`. The `50th` line of the Balmer series in the observed specturem is close to resolution at a diffraction angle `theta` (in accordace with Rayleigh's criterion). Find the angle.