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Introductory Physics Homework Help
Why 0.3m From Lens Is Optimal Focus?
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[QUOTE="phantomvommand, post: 6469563, member: 687416"] [B]Homework Statement:[/B] A lens has a focal length of 0.3m. A plane mirror is placed 0.2m behind the lens. Where must an object be placed, for its image to coincide with its position? [B]Relevant Equations:[/B] Ray diagrams thin lens formula Apparently, it must be placed at the focus (0.3m away from the lens). Why is this so? [/QUOTE]
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Why 0.3m From Lens Is Optimal Focus?
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