What is reflection? Question 3 options: 1) The process in which small particles suspended in a medium diffuse a portion of the incident radiation in all directions. 2) The process in which the direction of energy propagation is changed as it passes into a medium with a different density. 3) The process where a surface turns back a portion of the incident radiation into the medium through which the radiation approached. 4) The process in which the intensity of energy decreases with increasing distance from the energy source. 5) The process in which incident radiation is retained by a substance through which it passes. 6) The process in which radiation is separated into its component wavelengths