Auto collimator

From Wikiversity

An autocollimator is an optical instrument to measure small angles.This instrument uses the principle of optical reflection where a beam of light is projected on a mirror.The beam reflects with an angle as that of the mirror surface and as such the deflection can be meaured visually or by an electronic detector.The accuracy of an electronic detector can be as high as 100 times our visual detection.

[edit] Other types

A meauring tool which uses the principle of autocollimation is an angle dekkor.This instrument can be used to measure surface flatness.Here an illuminated scale is placed along with a fixed scale in the focal plane of the lens through which the incident and the reflected ray passes.

Angle dekkor can also be used to set up angle gauges standards for angle meaurements. Naveen chokker the nukra boy..............