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Working Principle: The basic components of an autocollimator include a light source, a collimator lens, a mirror, and a viewing telescope. The collimator lens produces a parallel beam of light which is directed towards the mirror. The mirror reflects the light back towards the collimator. A viewing telescope observes the returning beam. Any angular deviation of the mirror causes the reflected beam to move off-center in the telescope’s field of view, allowing the measurement of the angle.

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Understanding Autocollimators: Autocollimators utilize the principle of autocollimation, where a collimated light beam is reflected back onto itself by a mirror. The instrument measures the deviation of the reflected beam from its original path, which is directly proportional to the angular displacement of the mirror.

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Introduction: Autocollimators are precise optical instruments used for measuring small angular displacements. They find applications in various fields including metrology, alignment, and optical testing. This article provides an overview of autocollimators, their working principles, common applications, and recent advancements.

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