warning light - a cautionary sign of danger.

red light. visual signal - a signal that involves visual communication.

idiot light - a colored warning light on an instrument panel (as for low oil pressure)

Light is a type of energy. It is a form of electromagnetic radiation of a wavelength which can be detected by the human eye.[1] It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun. Animals can also see light. The study of light, known as optics, is an important research area in modern physics. When light hits an opaque object it forms a shadow.

Light is electromagnetic radiation that shows properties of both waves and particles. Light exists in tiny energy packets called photons. Each wave has a wavelength or frequency. The human eye sees each wavelength as a different colorRainbows show the entire spectrum of visible light. The separate colors, moving in from the outer edges, are usually listed as redorangeyellowgreenblueindigo and violet. Other colors can be seen only with special cameras or instruments: Wavelengths below the frequency of red are called infrared, and higher than of violet are called ultraviolet.

The other main properties of light are intensitypolarizationphase and orbital angular momentum.

In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.[2][3] This article is about visible light. Read the electromagnetic radiation article for the general concept.

The law of reflection is what allows us to see an object reflected in a mirror.

In a vacuum, light moves at the speed of light, which is 299,792,458 meters per second[4] (or about 186,282 miles per second). This means it takes about 8 minutes for light to reach Earth from the Sun.[5][6] In glass it travels at about two-thirds as fast.

Light moves in a straight line, creating shadows when the path of light is blocked. More solid things will have a darker shadow, things that are more clear have a lighter shadow, and transparent things will have none or very little shadow. Light can pass through transparent things the most easily. When light is not in a vacuum, it travels more slowly than its maximum speed of light. The slowest light ever recorded moved at 39 miles per hour.[7] Our eyes react to light; when we see something we see the light it reflects, or the light it emits. For example, a lamp gives off light, and everything else in the same room as the lamp reflects its light.


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