tha power of a convex lense of focal length 25 cm is _________
Answers
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:
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 ‘+’.