Question

Doctor advice Raju to use focal length of lens 25cm and find the power of lens.
Plz tell clearly I will keep as brainlist

Answer 1

Answer:

The focal length of the lens advised to him is 25 cm.

We know that, power of the lens is reciprocal of the focal length of the lens.

Hence, Power = 1/25

➸ P = 0.04 D (dioptre) [Convex Lens]

POWER :–

➸ Power is said to be the ability of the lens to converge or diverge light rays.

➸ The power depends on the focal length of the lens.

➸ The power of a lens is represented by P.

➸ The S.I. unit of Power is dioptre (D).

➸ P = 1/f.

➸ If the focal length given is positive, the power of lens is positive.

➸ If the focal length given is negative, the power of lens is negative.

➸ Positive power implies that the lens is convex.

➸ Negative power implies that the lens is concave.