A camera focuses on a distant object when the film is 5 cm from the lens.What is the focal length of the lens?

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A camera focuses on a distant object when the film is 5 cm from the lens.What is the focal length of the lens?

2007-08-12 11:25:54 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

2 answers

If the object is far away, all teh rays from teh object to the lens are parallel. Since the lens brings them to a focus at 5cm, the by definition of focal length, the focal length is 5 cm

2007-08-12 11:35:32 · answer #1 · answered by nyphdinmd 7 · 0⤊ 0⤋

5 cm

2007-08-12 18:30:23 · answer #2 · answered by Renaissance Man 5 · 0⤊ 0⤋