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Reference.org
Telescopic sight
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<p>A telescopic sight, commonly called a scope informally, is an <a href="/facts/Optical_instrument/jB29DQNk">optical</a> <a href="/facts/Sight_(device)/8oeQ5xce">sighting device</a> based on a <a href="/facts/Refracting_telescope/JtCz5CvW">refracting telescope</a>. It is equipped with some form of a <a href="/facts/Frame_of_reference/15yYfB9M">referencing</a> pattern – known as a <i><a href="/facts/Reticle/VdqW580Q">reticle</a></i> – mounted in a focally appropriate position in its <a href="/facts/Optical_system/p0vq4S1T">optical system</a> to provide an accurate point of aim. Telescopic sights are used with all types of systems that require <a href="/facts/Magnification/ACFaV1Bd">magnification</a> in addition to reliable visual aiming, as opposed to non-magnifying <a href="/facts/Iron_sights/v0NvpvhH">iron sights</a>, <a href="/facts/Reflector_sight/uRaaCAFL">reflector (reflex) sights</a>, <a href="/facts/Holographic_sight/vCzXTyNK">holographic sights</a> or <a href="/facts/Laser_sight/SaP0CbMF">laser sights</a>, and are most commonly found on <a href="/facts/Long_gun/MQwcenpv">long-barrel</a> <a href="/facts/Firearm/GuHx4aGE">firearms</a>, particularly rifles, usually via a <a href="/facts/Scope_mount/arotbwfc">scope mount</a>. Similar devices are also found on other platforms such as <a href="/facts/Artillery/GLpMYG9o">artillery</a>, <a href="/facts/Tanks/CwQLRQsy">tanks</a> and even <a href="/facts/Aircraft/EhC4mBep">aircraft</a>. The optical components may be combined with <a href="/facts/Optoelectronics/0SCr9px0">optoelectronics</a> to add <a href="/facts/Night_vision_device/jJ58YGa0">night vision</a> or <a href="/facts/Smart_device/cnm7E5Vh">smart device</a> features. </p>