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    camera uses single lens: image distance for object at infinity? please help!?

    A film camera uses a single lens with a focal length f = 58 cm. (a) Calculate the image distance for an object at infinity. in cm (b) Calculate the image distance for an object that is 2.7 m away. in cm (c) How far must the lens be moved with respect to the film when an object moves from...
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    physics problem about double-slit interference: what is the distance between

    the interferences? please help!? Two small stereo speakers are 2.6 m apart and act as a double-slit interference experiment with sound waves. If the opposite wall of the room is 6.5 m away and the sound frequency is 1.7 kHz, what is the distance between the two interference maxima nearest the...
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