# A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = +40.8 cm. Precisely 36.6 cm behind this lens is a concave lens with a focal length f2 = -14.8 cm. The object to be photographed is 3.92 m in front of the objective lens.(a) What is the lateral magnification of this lens combination?

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A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = +40.8 cm. Precisely 36.6 cm behind this lens is a concave lens with a focal length f2 = -14.8 cm. The object to be photographed is 3.92 m in front of the objective lens.

(a) What is the lateral magnification of this lens combination?

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Step 1

The image from the first lens will act as the object of the second.

The distance to the image from the objective lens can be calculated as follows,

Step 2

So the object distance of the concave lens is –(45.55-36.6) = -8.95cm.

Then...

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