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a camera with a 200mm lens(focal length) makes a real image of a bird on film.The film is located 201 mm behind the lens.Determine the distance from the lens to the bird.
2 answers
Use the lens equation:
1/0bject distance + 1/imagedistance= 1/focal length.
1/0bject distance + 1/imagedistance= 1/focal length.