46. What is light?

Jawaban:

46.Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.

47.two basic types of light sources: Incandescence and Luminescence.

48.Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

49.a dark area or shape produced by a body coming between rays of light and a surface.

50.you can see your reflection in many every day objects.

happy to help;)))