Barlow lens
Quick Summary
A Barlow lens is a diverging lens used to increase the magnifying power of a telescope. These lenses were invented by Peter Barlow, an English mathematician and optician, in the early 19th century. Barlow developed two types of achromatic lenses, meaning they did not distort color. His lenses, which have become widely used, are incorporated into optical instruments to enhance their eyepiece power.12
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