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What are coaxial lenses and where are th...

What are coaxial lenses and where are they used?

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Coaxial lenses are lenses having common principal axes. A compound microscope, in its simple form , consists of coaxial lenses ( two lenses having same principal axes ) mounted on the outer ends of the hollow metallic tubes. One of the lenses act as the objective and the other as the eyepiece.
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