REFRACTION OF LIGHT
Qn: What is refraction of light?
Refraction is the bending of light due to the change of its speed when it passes from one medium to another of a different optical densities.
Qn: When does it happen? How and when will light bend?
The bending occurs because the speed in which light travels through a substance depends on the substance’s density. Light only bends when it passes from a substances of one density into a substances of a different density. Since light travels slower in water then in air, water is said to have a greater optical density than air.
Qn: What it refractive index?
It is the ratio of speed in light in vacuum and speed of light in the material.
Qn: Effects of refraction?
Bending of objects
Objects partially submerged in water appear bent, shifted and magnified.
Apparent thickness
Glass blocks appear less thick than they actually are.
Apparent depth
Swimming pools appear shallower than they actually are.
Apparent position
At dawn or dusk, then Sun appears to be above the horizon at its apparent position for about four minutes longer than it really is.
Source; textbook resource and http://en.wikipedia.org/wiki/Refraction
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