How r power and focal length of a lens related? U r provided with two lenses of focal length 20cm and 40cm respectively which lens will u use to obtain more convergent light?

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Solution

The power of a lens is related to its focal length as
P = 1/f (in m).
More the power of a lens more is its converging power. Thus, the lens of shorter focal length will have more converging power.
so I will use lens with the focal length of 20 cm.

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(b) What is the unit of power of a lens? Define the unit of power of a lens.

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How r power and focal length of a lens related? U r provided with two lenses of focal length 20cm and 40cm respectively which lens will u use to obtain more convergent light?

The power of a lens is related to its focal length as P = 1/f (in m). More the power of a lens more is its converging power. Thus, the lens of shorter focal length will have more converging power. so I will use lens with the focal length of 20 cm.

The power of a lens is related to its focal length as
P = 1/f (in m).
More the power of a lens more is its converging power. Thus, the lens of shorter focal length will have more converging power.
so I will use lens with the focal length of 20 cm.