Infrared light includes a range of wavelengths, spanning from one millimeter down to 750 nanometers. The top end of wavelengths include those used for communication, and the lower ranges are those used for visible light. More »

Photosynthesis is most efficient at light wavelengths between 400 and 500 nanometers and 600 to 700 nanometers. The green pigment, chlorophyll, restricts the efficiency of photosynthesis. More »

The wavelength of ultraviolet light is 400 nanometers or less. Visible light and color range from 400 nanometers to 750 nanometers. The region just below the visible wavelength is called near ultraviolet. More »

www.reference.com Science Physics Optics & Waves

Infrared is energy with a longer wavelength than visible light, existing just outside the range of human vision. The sun is a natural source of infrared energy, as well as many other forms of energy from across the elect... More »

The wavelength of ultraviolet light is 400 nanometers or less. Visible light and color range from 400 nanometers to 750 nanometers. The region just below the visible wavelength is called near ultraviolet. More »

www.reference.com Science Physics Optics & Waves

In the visible light spectrum, the wavelength of red light ranges from 622 to 780 nanometers. Red light has the longest wavelength and the shortest frequency. Violet light, which has the shortest wavelength, is at the ot... More »

Lasers are mostly red in color because red has the longest wavelength, approximately 650 nanometers. Because of this, red does not scatter easily and can be viewed from a long distance. More »