What is the longest wavelength of light that can be seen with the human eye?
A)400 nanometres
B)700 nanometres
C)7000 nanometres
D)3×10⁸ m

Question

Quizplus · Accepted Answer

The longest wavelength of light that can be seen with the human eye is approximately 700 nanometres, which corresponds to the color red. This is at the far end of the visible light spectrum, and wavelengths longer than this fall into the category of infrared radiation, which is not visible to the naked eye.

What Is the Longest Wavelength of Light That Can Be