1580nm
Object size should be comparable to wavelength of light
so it is comparable of 400nm to 700nm
[tex]n=\frac{10^-^3}{632.8*10^-^9}[/tex]
1580 nm
What is wavelength?
It is measured in the direction of the wave.The distance from one crest to another, or from one trough to another, of a wave is defined as its wavelength (which may be an electromagnetic wave, a sound wave, or any other wave). Because wavelength is a distance/length, it is measured in length units such as metres, centimetres, milimetres, nanometres, and so on.
To learn more about wavelength from the given link:
https://brainly.com/question/13533093
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