why is the power of lens expressed as a reciprocal of focal length?state it si unit.
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As we know that the power of a lens is defined as the ability of a lens to converge or diverge incoming light rays.
So, a lens of higher power would converge or diverge light rays to a greater extent. Now, the focal length of a lens is also related to its diverging or converging ability but it varies inversely.
Thus, the relation between power and focal length is inverse such that power is given as the reciprocal of the focal length of a lens.
So, a lens of higher power would converge or diverge light rays to a greater extent. Now, the focal length of a lens is also related to its diverging or converging ability but it varies inversely.
Thus, the relation between power and focal length is inverse such that power is given as the reciprocal of the focal length of a lens.
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hey mate ur ans
It is the reciprocal of the focal length of thelens taken in metres. Its S.I. unit is Dioptre( D ). 1 Dioptre is defined as the power of a lenswhose focal length is 1 m.
It is the reciprocal of the focal length of thelens taken in metres. Its S.I. unit is Dioptre( D ). 1 Dioptre is defined as the power of a lenswhose focal length is 1 m.
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