Question

what is difference between Newtonian and cassegrain telescope ​

Answer 1

Larger reflecting telescopes use something known as a Cassegrain focus. A Cassegrain telescope is a kind of reflecting telescope where a secondary mirror reflects light back through a hole in the primary mirror's center. ... So, the big difference between the Cassegrain and Newtonian telescope should be quite obvious.

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Answer 2

https://study.com/academy/lesson/different-kinds-of-traditional-reflecting-telescopes.html