Ray Optics and Optical Instruments - Result Question 7
7. Ray optics is valid, when characteristic dimensions are
[1989]
(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
Topic 2: Refraction of Light at Plane Surface & Total Internal Reflection
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Answer:
Correct Answer: 7. (d)
Solution:
- (d) Characteristic dimensions must be much larger than the wavelength of light.
