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Ray optics is valid, when characteristic dimensions are

1. of the same order as the wavelength of light
2. much smaller than the wavelength of light
3. of the order of one millimetre
4. much larger than the wavelength of light

Correct answer: much larger than the wavelength of light

Solution

Ray optics is valid when the characteristic dimensions of the system (such as the size of apertures or obstacles) are much larger than the wavelength of light. This ensures that diffraction effects are negligible.

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