Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
Telescopes - schoolphysics
what telescope should i look for?
f-number - Wikipedia
Telescope Equations: Magnification
Refractive Telescopes
vik dhillon: phy217 - basic principles
A beginner's guide to magnification with telescopes - Astrofarm
Telescope Focal Length Explained: Why Does It Matter? | StarLust
Thiery Legault - How to adjust the focal length ?
Aperture, focal length and focal ratio - Optics Trade Blog
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
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Telescope Basics 2 (of 6): Learn to calculate magnification for a telescope/understand focal ratios - YouTube
The focal lengths of an objective lens and eyepiece are 192 cm and 8 cm respectively in a small telescope. Calculate its magnifying power and the separation between the two lenses.
Telescope stats explained | BBC Sky at Night Magazine
Two-mirror telescopes: Cassegrain, Gregorian and variants
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How Telescopes Form Images - Video & Lesson Transcript | Study.com
How to Calculate Telescope Magnification
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Telescope Calculator: How Does Your Telescope Perform? | Sky & Telescope - Sky & Telescope
Bintel Astronomy Setup Calculator - Bintel
what telescope should i look for?
