refraction of light notes
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Refraction is the change in the ditection of wave from one medium to another medium...
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1. Ray of Light : A line drawn in the direction of propagation of light is called a ray of light.
2. Beam of Light : A group of rays of light emitted by a source of light is called a beam of light. A light beam is of three types.
(i) Parallel beam : A group of light rays parallel to each other is known as parallel beam of light. 7.
(ii) Divergent beam : A group of light rays spreading out from a source of light is called divergent beam of light.
3. Reflection of Light : There are some surfaces which have ability to send the light back in the same medium when light strikes it. This 9. phenomena of sending the light back in the same medium by a surface is called reflection of light.
(i) The incident ray, the reflected ray and the normal at the point of incidence, all lie in a same plane.
(ii) The angle of incidence is always equal to the angle of reflection, ∠i = ∠r.
2. Beam of Light : A group of rays of light emitted by a source of light is called a beam of light. A light beam is of three types.
(i) Parallel beam : A group of light rays parallel to each other is known as parallel beam of light. 7.
(ii) Divergent beam : A group of light rays spreading out from a source of light is called divergent beam of light.
3. Reflection of Light : There are some surfaces which have ability to send the light back in the same medium when light strikes it. This 9. phenomena of sending the light back in the same medium by a surface is called reflection of light.
(i) The incident ray, the reflected ray and the normal at the point of incidence, all lie in a same plane.
(ii) The angle of incidence is always equal to the angle of reflection, ∠i = ∠r.
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