When can it be assumed that light moves in a | vedclass

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(C) The rectilinear propagation of light is a valid approximation in the field of ray optics. This approximation holds true when the size of the obsta

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When the size of the obstacle or aperture is very large compared to the wavelength of light.

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(C) The rectilinear propagation of light is a valid approximation in the field of ray optics. This approximation holds true when the size of the obstacles or apertures $(a)$ encountered by the light is much larger than the wavelength of the light $(\lambda)$. Mathematically, this condition is expressed as $a \gg \lambda$. Under this condition, the effects of diffraction are negligible, and light appears to travel in straight lines.

When can it be assumed that light moves in a straight line?

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