Define power of a convex lens. What its units?

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Solution

Power of a convex lens is the converging ability of it, and is given as the reciprocal of its focal length.
that is, $P = \frac{1}{f}$
Since unit of focal length $f$ is $m e t e r$ , the unit of power is $m e t e r^{- 1}$ .

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Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?

Q. (a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends.
(b) What is the unit of power of a lens? Define the unit of power of a lens.
(c) A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.A optical instrument in which the above arrangement of convex lens is used is a convex lens used to burn paper by focusing sunlight.

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Define power of a convex lens. What its units?

Power of a convex lens is the converging ability of it, and is given as the reciprocal of its focal length.that is, P=1fSince unit of focal length f is meter, the unit of power is meter−1.

Power of a convex lens is the converging ability of it, and is given as the reciprocal of its focal length.
that is, $P = \frac{1}{f}$
Since unit of focal length $f$ is $m e t e r$ , the unit of power is $m e t e r^{- 1}$ .