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?

Open in App

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.

Suggest Corrections

Similar questions

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???

Q. You are given two lenses, a converging lens with focal length + 10 cm and a diverging lens with focal length -20 cm. Which of the following would produce a real image that is smaller than the object?

Join BYJU'S Learning Program

Explore more

Power

Standard X Physics

Join BYJU'S Learning Program

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.