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Camera A has a lens with an aperture diameter of 7.50 mm. It photographs an object using the correct exposure time of 3.33×10⁻²s. What exposure time should be used with camera B in photographing the same object with the same film if this camera has a lens with an aperture diameter of 23.2 mm? The lenses of cameras A and B have the same focal length.
Sagot :
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