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An object is located to the left of a concave lens whose focal length is 35 cm. The magnification produced by the lens is 1/3. calculate the distance through which the object should be moved to decrease the magnification to 1/4?

when the mars rover was deployed on the surface of mars in july 199, radio signals took about 12 minutes to travel from earth to the rover. A) how far was mars from Earth at the time? b) assuming the broadcasting frequencey was 0khz, what was the wave length of the radio wave?

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