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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:
A light is a form of energy. A beam of light always travels in a straight line but when it passes from one medium to another, it gets bent.
The mediums of light are as follows:
The process of bending of light as it passes from one medium to another medium is called refraction of light.
The velocity of light in rarer medium is higher than the denser medium. Because of variation in speed of light at two media, it bends. So the change in speed of light when it passes from one medium to another medium is the main cause of refraction.
The effects of refraction are as follows: (i) A stick partly immersed in water and placed inclined to the surface, appears bent at the surface. (ii) A swimming pool appears swallower than it really is.
A form of energy which produces the sensation of sight is called ______.
The bending of light as it passes from one medium to another medium is called ______.
defracton of light
deflection of light
refraction of light
reflection of light
When a light rays travels from rarer to a denser medium, it bends towards the normal. It means the angle of incidence is ______.
greater than the angle of reflection
smaller than the angle of refraction
greater than the angle of refraction
smaller than the angle of reflection