A-thin-bi-convex-lens-rest-on-a-plane-mirror-it-is-found-that-a-point-objects-placed-20cm-above-the-object-coincide-with-it-own-image-Determine-the-position-and-nature-of-the-image-when-the-obje

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Question Number 19345 by tawa tawa last updated on 10/Aug/17

$$\mathrm{A}\mathrm{thin}\mathrm{bi}-\mathrm{convex}\mathrm{lens}\mathrm{rest}\mathrm{on}\mathrm{a}\mathrm{plane}\mathrm{mirror}.\mathrm{it}\mathrm{is}\mathrm{found}\mathrm{that}\mathrm{a}\mathrm{point}$$$$\mathrm{objects}\mathrm{placed}20\mathrm{cm}\mathrm{above}\mathrm{the}\mathrm{object}\mathrm{coincide}\mathrm{with}\mathrm{it}\mathrm{own}\mathrm{image}.$$$$\mathrm{Determine}\mathrm{the}\mathrm{position}\mathrm{and}\mathrm{nature}\mathrm{of}\mathrm{the}\mathrm{image}\mathrm{when}\mathrm{the}\mathrm{object}\mathrm{is}\mathrm{placed}$$$$\left(\mathrm{i}\right)8\mathrm{cm}\mathrm{and}\left(\mathrm{ii}\right)12\mathrm{from}\mathrm{the}\mathrm{lens}\mathrm{mirror}\mathrm{combinatiom}$$

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