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In geometrical optics a ray of light is defined as

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Path of propagation of light

Path of propagation of energy for $λ \to 0$

Path of propagation of shadows

Direction of formation of image

answer is D.

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Detailed Solution

In geometrical optics, a ray is defined as the path of energy propagation in the limit of wavelength tending to zero. The wavelength of visible light was measured and found to be extremely small, e.g. the wavelength of yellow light is about 0.5μm

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