Light is a form of energy which produces the sensation of sight. The main source of heat and light energy in the earth is the sun.
The bending of light as it passes from one medium to another medium is called refraction of light.
Laws of refraction of light
In the figure, the incident ray AO refracted ray OB and normal ray MN at the point of incidence O; all lie in the same plane.
i.e = (µ) constant.
In the figure,∠ i is the angle of incidence in the air and ∠ r is the angle of refraction. In another medium glass in which the light enters. The ‘constant’ is called refractive index (R.I.) of the glass where light enters. It is denoted by µ.
The Snell’s law can be stated in the following ways:
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