A telescopic sight, commonly called a scope, is an optical sighting device based on a refracting telescope. It is equipped with some form of a referencing pattern (a reticle) mounted in a focally appropriate position in its optical system to give an accurate point of aim. Telescopic sights are used with all types of systems that require accurate aiming but require magnification, as opposed to using non-magnifying iron sights, reflector (reflex) sights, holographic sights or laser sights, and are most commonly found on firearms, particularly rifles. The optical components may be combined with optoelectronics to form a digital night scope or a “smart” scope. Scope sights are usually attached to a firearm with a scope mount. Go to google.com to know more about telescopic sights for firearms.