News tagged with light

Related topics: wavelength · solar cells · laser · physical review letters · photons

Choosing the right sunglasses

(HealthDay)—You might think of eye problems like cataracts as signs of old age, but one step you can take now will protect your vision for the future—and you can do it with style.

Jun 23, 2017
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The neural relationship between light and sleep

Humans are diurnal animals, meaning that we usually sleep at night and are awake during the day, due at least in part to light or the lack thereof. Light is known to affect sleep indirectly by entraining—modifying the length ...

Jun 23, 2017
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Light

Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm, or perhaps 380–750 nm.) In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Three primary properties of light are:

Light, which exists in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.

This text uses material from Wikipedia, licensed under CC BY-SA

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