A telephoto lens consists of a positive lens of focal length +3.5 cm placed 2.0 cm in

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A telephoto lens consists of a positive lens of focal length +3.5 cm placed 2.0 cm in front of a negative lens of focal length -1.8 cm. 

(a) Locate the image of a very distant object. 

(b) Determine the focal length of the single lens that would form as large an image of a distant object as is formed by this lens combination.

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