How will you define a ray of light?
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A ray of a light is an electromagnetic wave or radiation which is able to seen by us ....... it expels some heat an it is the fastest wave in the world which is about 3×10^5 m/s.
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Definition:-
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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