Question

tha power of a convex lense of focal length 25 cm is _________​

Answer 1

Explanation:

The power of a lens (P) is inversely proportional to the focal length (f) and it is measured as the reciprocal of the lens's focal length. ... Since it is a positive focal length, the lens will be a convex lens or a converging lens and the power is written as '+'.

Answer 2

Answer:

The power of a lens (P) is inversely proportional to the focal length (f) and it is measured as the reciprocal of the lens’s focal length. The focal length of a lens is usually measured in meters and the power of the lens is measured as Dioptre. A focal length of 1 meter gives 1 dioptre power of the lens.

P = 1 / f (in meters)

P = 1 / 25 cm

P = 1 / 0.25 m

P = + 4 D.

Since it is a positive focal length, the lens will be a convex lens or a converging lens and the power is written as ‘+’.

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