Professor $C.V.$ Raman surprised his students by suspending a tiny light ball in a transparent vacuum chamber by shining a laser beam on it. Which property of $EM$ waves was he exhibiting? Give one more example of this property.

(N/A) Electromagnetic waves carry both energy and momentum. When these waves strike a surface,they transfer this momentum,thereby exerting radiation pressure.
In this experiment,the radiation pressure exerted by the laser beam counteracts the force of gravity,allowing the tiny ball to remain suspended in the vacuum chamber.
Another example of this property is the formation of comet tails. As a comet approaches the Sun,the radiation pressure from solar light pushes the dust and gas particles away,creating a tail that always points away from the Sun.