Which region of the spectrum contains wavelengths from 400 to 700 nm?

Which region of the spectrum contains wavelengths from 400 to 700 nm?

• A. Visible light
• B. UV
• C. Infrared
• D. Microwave

Answer: (A)

Visible light is the portion of the electromagnetic spectrum that the human eye can detect, centered around wavelengths from about 400 to 700 nanometers. Within this range, different wavelengths correspond to the colors we perceive, with violet near the lower end and red near the higher end. Wavelengths shorter than 400 nm fall into the ultraviolet region and are not visible, while wavelengths longer than 700 nm fall into the infrared region and are not visible either. Microwaves have much longer wavelengths and are used for other applications. So, the 400–700 nm range is the visible light region.

Visible light is the portion of the electromagnetic spectrum that the human eye can detect, centered around wavelengths from about 400 to 700 nanometers. Within this range, different wavelengths correspond to the colors we perceive, with violet near the lower end and red near the higher end. Wavelengths shorter than 400 nm fall into the ultraviolet region and are not visible, while wavelengths longer than 700 nm fall into the infrared region and are not visible either. Microwaves have much longer wavelengths and are used for other applications. So, the 400–700 nm range is the visible light region.