A person on a safari wants to take aphotograph of a, Ask an Expert

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A person on a safari wants to take aphotograph of a hippopotamus from a distance of 76.0 m. The animal is 5.00 m long and its image is to be 1.30 cm long on the film.

(a) What focal length lens should be used?

(b) What would be the size of the image if a lens of 50.0 mm focallength were used?

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