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  2. AN/PVS-4 - Wikipedia

    en.wikipedia.org/wiki/AN/PVS-4

    AN/PVS-4 ( Night Vision Sight, Individual Served Weapon, AN/PVS-4) is the U.S. military designation for a specification of the first second generation passive Night vision device . The AN/PVS-4 first saw widespread use during the Gulf War and later some deployment in the Iraq War and has since been replaced by modern third-generation weapon sights.

  3. Night-vision device - Wikipedia

    en.wikipedia.org/wiki/Night-vision_device

    The device enhances ambient visible light and converts near-infrared light into visible light which can then be seen by humans; this is known as I 2 (image intensification). By comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum.

  4. Amazon Kindle - Wikipedia

    en.wikipedia.org/wiki/Amazon_Kindle

    The device has a black front, with either a silver or gold colored back. [89] The Oasis 2 is the first Kindle to be IPX8 rated so it is water-resistant up to two meters for up to 60 minutes, and first to be able to change the background black and the text to white.

  5. Night vision - Wikipedia

    en.wikipedia.org/wiki/Night_vision

    Night vision is the ability to see in low-light conditions, either naturally with scotopic vision or through a night-vision device. Night vision requires both sufficient spectral range and sufficient intensity range. Humans have poor night vision compared to many animals such as cats, dogs, foxes and rabbits, in part because the human eye lacks ...

  6. Image intensifier - Wikipedia

    en.wikipedia.org/wiki/Image_intensifier

    An image intensifier or image intensifier tube is a vacuum tube device for increasing the intensity of available light in an optical system to allow use under low-light conditions, such as at night, to facilitate visual imaging of low-light processes, such as fluorescence of materials in X-rays or gamma rays (X-ray image intensifier), or for conversion of non-visible light sources, such as ...

  7. Infrared - Wikipedia

    en.wikipedia.org/wiki/Infrared

    A false-color image of two people taken in long-wavelength infrared (body-temperature thermal) radiation. This pseudocolor infrared space telescope image has blue, green, and red corresponding to wavelengths of 3.4, 4.6, and 12 μm, respectively. Infrared ( IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths ...

  8. Crookes radiometer - Wikipedia

    en.wikipedia.org/wiki/Crookes_radiometer

    Crookes radiometer. The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation ...

  9. List of Wear OS devices - Wikipedia

    en.wikipedia.org/wiki/List_of_Wear_OS_devices

    The following is a comparative list of wearable devices using the Wear OS operating system. ... Q Marshal (Gen 2) 2016-03-15 Wear OS 2.0 H MR1 (Android 9.0.0)

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