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Physics problems example with solution - Optics - problem 10

A converging lens (f1 = 20 cm) and another converging lens (f2 = 10 cm) are arranged coaxially at a distance of d = 50 cm one from another. On the left of the first convergent lens at distance (- x) = 60 cm it is an object with height Y1 = 5 cm . Where is formed the final image? What nature and what height has the image?
















Solution

The image of the object in the first lens is formed at a distance:








compared to this, in her right side is a real image, inverted and smaller than object AB because:








This image becomes object for the second lens placed at:







Since A'B' is located on the left side of the second convergent lens, is becomes real object to it:










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