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This question already has an answer here:

Astronomical telescope has a small eye piece and a large objective lens. Whereas a compound microscope has a large eye piece and small objective lens. Therefore can we use astronomical telescope as compound microscope by viewing it from objective lens?

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marked as duplicate by M. Enns, Jon Custer, John Rennie, stafusa, ZeroTheHero Jan 11 at 8:20

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    $\begingroup$ Possible duplicate: physics.stackexchange.com/questions/74128/… (the answer there notes that a telescope is optimised for magnifying far away objects whilst microscopes are optimised for nearby ones). $\endgroup$ – jacob1729 Jan 10 at 10:16
  • $\begingroup$ So can we use it as least efficient microscope $\endgroup$ – Naga Sandesh Goli Jan 10 at 10:26
  • $\begingroup$ Ya, I understood that microscope increases the size of the object to view it clearly, whereas telescope brings the object closer as image to view it clearly. $\endgroup$ – Naga Sandesh Goli Jan 10 at 11:09
  • $\begingroup$ Ok! I understood. $\endgroup$ – Naga Sandesh Goli Jan 10 at 12:50
  • $\begingroup$ Ok! I understood. $\endgroup$ – Naga Sandesh Goli Jan 11 at 6:31
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Telescopes are usually not build with magnification in mind. It is rather having the highest possible angular resolution! You want to be able to distinguish two spot-like light sources close to each other, not to see them as large as possible but smeary. Therefore, you want to have your telescope dish as large as possible. I think you just have another purpose than with an enlarging microscope...

Or was your question rather theoretically?

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  • $\begingroup$ Ok! I understood. $\endgroup$ – Naga Sandesh Goli Jan 10 at 13:51
  • $\begingroup$ Yes my question is theoretical. $\endgroup$ – Naga Sandesh Goli Jan 10 at 13:52

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