What is a ray of light ?
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A light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes.
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♡ᴀɴsᴡᴇʀ:-
The light travelling in any one direction in a straight line is called A ray of light. A group of light rays given out from a source is called a beam of light.
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