Which of the two has a greater power : a lens of short focal length or a lens of large focal length ?
If lens I has focal length +15 cm and lens II has focal length + 30 cm. Which lens has more power?
If lens A has focal length +15 cm and lens B has focal length +30 cm, find out which lens has more power?
The lens A has a focal length of 25 cm whereas another lens B has a focal length of 60 cm. Giving reason state, which lens has more power : A or B.