Light
Define light
Electromagnetic energy made of different wavelengths
The darkest part of a shadow is known as the
Umbra
What are two sources of natural light
Sun and stars
What are two artificial sources of light
Light bulbs and matches
The two categories of light are?
Incandescence and luminescence
Bioluminescence
Light that occurs in nature
The bending of light when it passes through a different medium
Refraction
The visible light colour with the lowest frequency is:
Red
Phosphorescence
When radiation is absorbed by a substance
Chemiluminescence
Light produced form a chemical reaction
A shape that bulges, a lens that is thin on the edges and thick in the middle is:
Convex
How do you correct near sightedness
Near sightedness is corrected with a convex lens
Opaque
A solid object that light cannot pass through
Visible light is measured using the following unit
Lumens
Two characteristics of good light
Shiny and smooth
Two characteristics of a poor light reflectors
Dark and rough
Transparent
A medium light can easily pass through
When light hits a smooth, mirror like surface and has a predictable angle of reflection it is known as
Specular reflection