Tripling the focal length of a telephoto lens,while holding aperture size constant,will change the light intensity admitted to the film by what factor?
A)0.11
B)0.33
C)3.0
D)9.0

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The Answer of Tripling the focal length of a telephoto lens,while holding aperture size constant,will change the light intensity admitted to the film by what factor?
A)0.11
B)0.33
C)3.0
D)9.0

Tripling the Focal Length of a Telephoto Lens,while Holding Aperture