The Center of curvature is 2 times the focal length.
By the way this is a physics question.
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This is a Zoom lens with a focal length of between 75 and 300 mm.
Applied to focusing lenses and mirrors, including telescopes, binoculars, and cameras, the focal ratio or 'F-number' is (the focal length of the lens or mirror) divided by (its aperture or diameter)
The answer is C hexagon
you must multiply the two lenses getting a total of 150X
It decreases it.