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A certain lens focuses light from an object 2.15 m m away as an image 48.6...

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Physics

A certain lens focuses light from an object 2.15 m m away as animage 48.6 cm c m on the other side of the lens.

Two converging lenses are placed 30.0 cmcm apart. The focallength of the lens on the right is 20.5 cmcm , and the focal lengthof the lens on the left is 11.5 cmcm . An object is placed to theleft of the 11.5 cmcm focal-length lens. A final image from bothlenses is inverted and located halfway between the two lenses. Howfar to the left of the 11.5 cmcm focal-length lens is the originalobject?

Answer & Explanation Solved by verified expert
4.2 Ratings (874 Votes)
1 The lens focuses an image 215m away from the lens and formsan image 486cm on the other side of the lens So by signconvention the object distance u 215m 215cm and imagedistance v 486cm If f is the focal length of the lens then thelens formula is given bySo the focal length of the lens is 3964cm Since the focallength id positive the lens is convex2    See Answer
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