Illumination is via a diffuse source set at the focal plane of a collimating lens.
2.
In a typical system, illumination is provided by a diffuse source set at the focal plane of a collimating lens.
3.
A common type ( used in applications such as aircraft gun sights ) uses a collimating lens and a beam splitter.
4.
In the original spectroscope design in the early 19th century, light entered a slit and a collimating lens transformed the light into a thin beam of parallel rays.
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