00:01
Yes, so the difference between reflection and refraction.
00:03
So reflection is the phenomenon where light rays bounce back after striking a surface.
00:13
And the angle at which the light hits the surface, known as the angle of incidence, is going to be equal to the angle at which it bounces back, which is the angle of reflection.
00:25
And then for refraction, yes, so refraction is going to be the phenomenon where light rays change direction when they pass from one medium to another due to a change in their speed.
00:40
So a change in direction is described by snell's law, which relates the angles of incidence and refraction to the ratio of the speeds of light in the two media.
00:57
So various forms of radiant energy.
01:01
Well, radiant energy can be thought of as energy transmitted in the form of electromagnetic waves.
01:08
So the electromagnetic spectrum, in increasing order of frequency, is going to be...
01:15
Okay, so again, the electromagnetic spectrum here, in increasing order of frequency, goes radio waves, then microwaves, infrared radiation, and then visible light, and then ultraviolet radiation, and then x -rays, and then gamma rays.
01:31
So why the amount of light reflected by different surfaces varies? well, the amount of light reflected by surfaces varies due to, well, first of all, surface roughness...