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Topic: Biographies
Number of pages / Number of words: 11 / 2972
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There is a central hole in the main mirror through which the light passes and is brought to a focus by an eyepiece lens. The tube of the Gregorian telescope is thus shorter than the sum of the focal lengths of the two mirrors. His novel idea was to use both mirrors and lenses in his telescope. He showed that the combination would work more effectively than a telescope which used only mirrors or used only lenses...


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His novel idea was to use both mirrors and lenses in his telescope. He showed that the combination would work more effectively than a telescope which used only mirrors or used only lenses.

The book was only a theoretical description of the telescope for at this stage one had not been constructed. Gregory remarks in the book [21]:-

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