amitbhawnani,
You might want to read these links, Tele Vue Optics Article Page
And, spacegazer - Telescope Basics
I hope this helps with your question on focal lengths and magnifications.
Dennis
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Dennis Miller
Raymond NH
12 Celestron Starhopper
10 Celestron Starhopper
6 inch Celestron ASGT refractor
8 inch Celstron SCT
Meade DSI
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