Q1: Auto collimator is used to check

ANS:B - angle

An auto collimator is primarily used to check angle. An auto collimator is an optical instrument used for measuring small angular deviations with high precision. It works based on the principle of collimation, where a light source is collimated (parallelized) into a beam and directed towards a target mirror or prism. The reflected beam is then observed through an eyepiece or detector. In industrial applications, auto collimators are commonly used for tasks such as:

1. Angle Measurement: Auto collimators are frequently employed to measure small angular deviations or changes in alignment, such as the tilt or angle of mechanical components in machinery or the alignment of optical elements in systems like telescopes or cameras.