Question

Ray optics is valid, when characteristic
dimensions are
(a) of the same order as the wavelength of light
(b) much smaller than the wavelength of light
(c) of the order of one millimetre
(d) much larger than the wavelength of light

Answer 1

opt (d)

hope this helps u

Answer 2

Ray optics is valid , when chatacteristic dimensions are much larger than the wavelength of light therefore option d is correct. ..

hope it helps. .