Question

The power of a convex lens is 2.5 dioptres.Find the focal length.​

Answer 1

Power = +2.5 D

F = 1/P = 1/2.5 = 0.4m = +40cm

Focal length is 40cm and it is a convex lens.

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#p@YAL

Answer 2

Power of convex lens = 2.5dioptre

|/f = 2.5m

f = |/2.5m

f= 0.40m

f = 40cm