Question

What is the power of convex lens of focal length 3cm

Answer 1

Answer:

Explanation:

FOCAL LENGTH= 3 CM

                           = 3*10^-2 M

POWER=1/ FOCAL LENGTH

POWER=1/3*10^-2

POWER=100/3

            = 33.3 M^-1.

HOPE THIS HELPS.

Answer 2

Explanation:

Convex (So Focal length is positive)

Given : f = +50 cm or +50 x 10^-2 m

To Find : P = ?

Formula : P = 1/f

P = 1/50 x 10^-2

P = 100/50

P = 2

Therefore P = 2 dioptre or 2 D