5. Projector instruments
5.1 Collimators
To adjust optical instruments, it is often necessary to have a distant light source, located in a stable direction. In a laboratory or workshop, distances are rarely large enough for a source to be considered infinite in relation to the instrument being adjusted. This is remedied by placing the source in the object focal plane of a lens or mirror, which gives an image at infinity (figure 18...
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Projector instruments
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