Physics history find in books please 1861 J. C. Maxwell, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects.
1901 P. N. Lebedev EXPERIMENTAL EXAMINATION OF LIGHT PRESSURE
2011 Grover Swartzlander first began to examine a revolutionary concept in optical physics after studying the flight of a moth. He watched the animal use its wings to create lift, which led to flight. Swartzlander asked : Could light be used to create the same effect?
You can see Wing ( 24:50 - first fly !)
https://youtu.be/PabPQbCnJz42012 Marosz my test ( camera ----bulb >>> motion )
EM preasure Dynamica Author = Grover Swartzlander + My mywork
light is hiting object
and Object aslo is able hit light !! 
2000 Rogera J. Shawyer EM drive http://emdrive.com/ !
