Question

Ray optics is valid, when characteristic dimensions of the obstacle 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
with explanation , will be marked as the brainliest

Answer 1

Answer:

Ray optics is valid when characteristic dimension are much larger than wavelength of light . The size of obstacle must be much larger than the wavelength of light. If wavelength is comparable to the size of object, then diffraction could happen, but it cannot be explained using ray optics, it will require wave theory of light.

Answer 2

Answer:

answer is 4th one because

Explanation:

Ray optics is valid when characteristic dimension are much larger than wavelength of light . The size of obstacle must be much larger than the wavelength of light. If wavelength is comparable to the size of object, then diffraction could happen, but it cannot be explained using ray optics, it will require wave theory of light.