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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How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

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A student uses a lens of focal length 40 cm and another of -20 cm. Write the nature and power of each lens.

(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.

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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.