Question

Two lenses of power 3D and -5D are placed in contact to form a composite

lens. An object is placed at a distance of 50 cm from this composite lens, find

the position of the image..At what distance should an object be placed from convex lens of focal length

18 cm to obtain an image at 24cm from it on the other side. What will be the


magnification produced in this case?​

Answer 1

Answer:

Three lenses in contact have a combined focal length of 12 cm. When the third lens is removed, the combined focal length is (60)/(7) cm. The third lens is

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Answer A diverging lens of focal length 30 cm