Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. what is the justification ?

Ray optics is based on the assumption that light travels in a straight

1.	Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. what is the justification ?
Answer» Solution :REASON is exactly same as in part (d). In most of the optical instruments size of INSTRUMENT is much greater than the wavelength of light. As a result, DIFFRACTION of light has negligible effect and we may apply principles of ray optics WITHOUT any hesitation.

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