with increase of focal length.the power lens is
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FOCAL LENGTH AND POWER INVERSELY PROPORTIONAL
SO IF f INCREASES POWER DECREASES
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If you increase the focal length then the size of the image on the film or sensor will increase i.e. the image will be magnified compared to a lens of shorter focal length. ... The power of a lens is inversely proportional to its focal length, being equal to 100/f where f is focal length in cm.
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