A narrow beam of  electrons passes immediately over the surface of a metallic mirror with a
Channel: Doubtnut
Date: 2020-08-23

A narrow beam of  electrons passes immediately over the surface of a metallic mirror with a diffraction grating with period `d = 2.0 mu m` inscribed on it. The electrons move with velocity `v,` comparable to `c`, at right angles to the lines of the grating. The trajectory of the electrons can be seen in the from of a strip, whose colouring depends on the observation angle `theta` (Fig.) Interpret this phenomenon. Find the wavelength of the radiations observed at an angle `theta = 45^(@)`. img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/IROD_V01_C05_E01_237_Q01.png" width="80%"