19. Changing exposure time from 1.8 to 3.6 impulses will ____ the density or darkness of the film a. Increase b. Double c. Half d. Both a and b
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Recall that the intensity of light reaching film in a camera is proportional to the effective area of the lens. Camera A has a lens with an aperture diameter of 8.00 $\mathrm{mm} .$ It photographs an object using the correct exposure time of $\frac{1}{30} \mathrm{s}$ . What exposure time should be used with camera $\mathrm{B}$ in photographing the same object with the same film if this camera has a lens with an aperture diameter of 23.1 $\mathrm{mm}$ ?
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