TS EAMCET 14-Sep-2020 Shift 1 Solved Paper

The momentum carried by a photon of energy E and wavelength λ is
where, h= Planck's constant.
When the photon hits on a perfectly reflecting surface, it reflects back in the opposite direction and goes with the same energy and hence the same momentum.
Hence, the change in momentum of the photon
This is equal to the momentum transferred by the photon to the surface.