Question 27
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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Solution

The power (P) and focal length (f) of a lens are related by the following equation
$P = \frac{1}{f}$
Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.

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Question 27
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?

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?

Q. 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 ?

Q. Out of the two lenses of focal length 20cm and 40cm, which lens is used to get more convergent light???

(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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Question 27 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?

The power (P) and focal length (f) of a lens are related by the following equation P=1f Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.

Question 27
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?

The power (P) and focal length (f) of a lens are related by the following equation
$P = \frac{1}{f}$
Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.