OPTICS

Optics is the study of the properties and behavior of light. In this section you can learn about everything from holograms to lasers and lenses.
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Invisibility Cloak For Real This Time?

We first reported on the possibility of an invisibility cloak last year. Now a different invisibility cloak is making the news -- one that uses metamaterials to redirect light away from the wearer.

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  • Illusion

    Illusion

    Illusion, an impression of a real stimulus, received through one of the senses, which does not agree with other sense impressions or with objective tests. See more »

  • Lens

    Lens

    Lens, a curved, transparent body (usually of glass) that refracts (bends) light rays. See more »

  • Light

    Light

    Light, the form of radiant energy that makes vision possible. Since sight is the most important of the senses, light furnishes most of the information we have about our surroundings. See more »

  • Mirror

    Mirror

    Mirror, a smooth, polished surface that reflects light rays and causes images to be formed. See more »

  • Optics

    Optics

    Optics, the branch of physics that deals with all aspects of visible light, including vision, and with infrared and ultraviolet radiation. See more »

  • Photometry

    Photometry

    Photometry, the measurement of the intensity of light and the illumination it produces. See more »

  • Rainbow

    Rainbow

    Rainbow, an arc or circle of light of different colors, caused by the refraction and reflection of sunlight by drops of water. See more »

  • What are the colors in the visible light spectrum?

    What are the colors in the visible light spectrum?

    All colors that you see fall into the visible light spectrum. Learn about the colors in the visible light spectrum in this article. See more »

  • When I stand at the water's edge and look out over the ocean, how far away is the horizon?

    When I stand at the water's edge and look out over the ocean, how far away is the horizon?

    When I stand at the water's edge and look out over the ocean, how far away is the horizon? Is there an equation to figure it out? See more »

  • Why does a mirror exchange left and right but not up and down?

    Why does a mirror exchange left and right but not up and down?

    Imagine wearing a T-shirt with lettering on it while brushing your teeth. Why are the letters on the T-shirt reversed in the mirror, while your head appears right side up? See more »

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