optical train
{{Short description|System of optical components to redirect beams of light}}
An optical train, also called an optical assembly, is an arrangement of optical components (e.g. lenses, mirrors, prisms) to guide a line of sight and/or a laser beam.{{cite book |title=Video Microscopy |author=Shinya Inoué |publisher=Springer Science & Business Media |isbn=9781475769258 |oclc=1066179097 |page=[https://books.google.com/books?id=0ajzBwAAQBAJ&pg=PA93 93] |date=2013}} For example, the position and angle of lenses may be adjusted to guide a laser through the path required. Optical instruments like microscopes, telescopes, and DSLRs all have optical trains that guide the incoming light towards a detector or the eye of an observer. The optical train of a telescope is commonly called an optical tube assembly (OTA) or simply an optical tube.
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