Question

Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of -
50 cm. What is the nature of the lens and its power used by each of them?​

Answer 1

Answer:

power of lens is known as the inverse of the focal length of the lens measured in metre SI unit of power is equal to dioptre of power of lens is equal to 1 / focal length in metre the focal length of first lens F1 is equal to 40 centimetre is equal to 0.4 m the lens used is a convex lens because the focal length is a positive value.

Explanation:

give the power of the lens is + we then it is a convex lens if the power of a lens is -ve the it is concave lens a what is the value of f is given in cm we should convert it to metre.

make me as brainlist.

Answer 2

Answer:

power of the lens is the reciprocal of the focal length.

its SI unit is dioptre.

P = 1/f or 100/f

100/50

+2 D

P = 100/f

100/-50

-2 D

the lens with the focal length of 50 cm is convex lens

the lens with the focal length of-50 is the concave lens