Problem based on focal length of the lens
A simple single lens camera (biconvex lens) is used to photograph a man 1.5 m tall who is standing 5.0 m from the camera. if the mans image fills the length of a frame of film (35mm) what is the focal length of the lens?
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A current 1.00 g sample of carbon shows 921 disintegrations perhour. If 1.00 g of charcoal from an archeological dig in alimestone cave in Slovenia shows5.50 x 103 disintegrations in 25.2 h, what is the age of the charcoal sample?
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