9.A2.0cmtalobjectisplaceperpendiculartotheprincipalaxisofaconcave
lensoffocallength15cm.Atwhatdistancefromthelens,shouldtheobjectbe
placedsothatitformsanimage10cmfromthelens?Alsofindthenatureand
thesizeofimageformed.
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can you please explain this to me
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