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| Telescopes |
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| Telescope is an optical instrument which is used for viewing heavenly bodies and distant objects. There are basically two types of telescopes: |
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 refracting telescope |
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 reflecting telescope |
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| Refraction
Telescope Reflection Telescope |
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| Refracting telescope uses a combination of lenses to form the images of distant objects. Astronomical telescope devised by Kepler and terrestrial telescope devised by Galileo are examples for refracting telescopes. |
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| Reflecting telescope uses a combination of a lens and a concave mirror to obtain the images of distant objects. |
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