Question

The visible wavelength range of light is approximately:

Options

• 10 nm to 100 nm

• 400 nm to 750 nm

• 100 nm to 400 nm

• 750 nm to 1200 nm

Answer 1

The visible spectrum spans approximately 400 nm (violet end) to 750 nm (red end). Radiation with wavelengths shorter than 400 nm is ultraviolet and longer than 750 nm is infrared, both of which are invisible to the human eye.