Question

The normal human eye can detect colors whose wavelengths range from 400 nm to?

1) 550 nm
2) 600 nm
3) 650 nm
4) 700 nm
5) 750 nm

Answer 1

The normal human eye can detect colors with wavelengths ranging from about 400 nm to 700 nm, which includes colors from violet to red.

Step-by-step explanation:

The normal human eye can detect colors with wavelengths that range from approximately 400 nm to 700 nm. This means that the spectrum visible to humans encompasses the colors violet (at the low end, around 400 nm) stretching through to red (at the high end, around 700 nm). The visible spectrum includes a variety of colors: violet (around 425 nm), indigo (around 450 nm), blue (around 470 nm), green (around 497 nm), yellow (around 565 nm), orange (around 600 nm), and red (700 nm). With our three types of cones, humans can perceive roughly 2 million distinct colors.