Luminous objects emit what?
Light
Objects that are NOT luminous are only visible when what?
That object is hit by light rays (light bounces off that object and enter the eye)
What id reflection?
When light bounces off a surface
Do light rays travel in a straight line?
Yes
What is the angle of reflection?
It is formed between the refelcted ray and the normal
What is the normal?
An invisible line perpendiculer to the reflective surface
Is the angle of incidence equal to the angle of incidence?
Yes