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Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
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Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm - YouTube
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Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
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Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
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Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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