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Ray optics is valid when characteristic dimension are

1. much smaller than wavelength of light.
2. of same order as wavelength of light
3. much larger than wavelength of light
4. none of the above

Correct answer: much larger than wavelength of light

Solution

Ray optics is an approximation that ignores diffraction and interference. That approximation is valid when the characteristic dimensions are much larger than the wavelength, so light travels in nearly straight lines.

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