2017 · Q27
Consider the electromagnetic; radiations having wavelengths 200 nm, 500 mm and 1000 nm. Which wavelength(s) of the following can make visual sensation to a human eye?
General KnowledgePhysics
- A200 nm and 500 nm
- B500 nm and 1000 nm
- C500 nm only
- D200 nm and 1000 nm
Explanation
Human vision spans roughly 380–750 nm. Of the three, only 500 nm (green light) falls in the visible band; 200 nm is ultraviolet and 1000 nm is infrared. (The question's ‘500 mm’ is a typo for 500 nm, as the options show.) Hence C.