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Ray optics is valid, when characteristic dimension ions are (a) much smaller than the wavelength of light

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Ray optics is valid, when characteristic dimension ions are 

(a) much smaller than the wavelength of light 

(b) much larger than the wavelength of light 

(c) of the same order as the wavelength of light 

(d) of the order of one millimetre

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(b) much larger than the wavelength of light

Ray optics is valid, when characteristic dimensions are much larger than the wavelength of light.

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