Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?
A
200 nm and 500 nm
B
500 nm and 1000 nm
C
500 nm only
D
200 nm and 1000 nm
Correct Answer: 500 nm only
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.