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a) A 50 mm lens is 51.3 mm away from a piece of film, where the...

a) A 50 mm lens is 51.3 mm away from a piece of film, where the image is formed in a photograph. How far away should the subject of the photograph stand in order to take an in-focus picture?

b)A thin lens has a focal length of f = -63 cm. If the image created by the lens is located a distance 13 cm away from the center of the lens, what is the magnification of the lens?

(c) A compound microscope is setup with 2 identical convex lenses with focal lenghts of f = 30 cm. The lenses are seperated by a distance d = 60 cm. If an object located do1 = 200 cm in front of lens 1, what is di2 (the final image location measured from lens 2)?

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