Question

Wavelength of radiation incident on a surface is 850 nm. Will the surface become visible when exposed to this radiation? Explain.

Answer 1

As we know, the range of wavelength of visible radiation is from 400 nm to 700 nm. The radiation having wavelength greater than 700 nm is termed as infra-red radiations which only produces warmth, so the wavelength of radiation 850 nm cannot be visible.