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the focal lengths of a convex lens and concave lens are 10cm and 15cm respectively.Both lenses are kept in contact.An object is placed at a distance of 25cm from this combined lens. determine the position of image of the object |
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Answer» Given, f1=+10cm for convex lens f2=−20cm for CONCAVE lens The focal length of the COMBINATION is given by f1=f21+f21 f1=+10cm1+−20cm1=20cm1 f=+20cm |
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