Question

The power of a convex lens is 2.5 dioptres. Find its focal length? *
0.4 cm
0.04cm
4cm
40cm
​

Answer 1

focal length = +40cm

Correct question:-

The power of a convex lens is 2.5 dioptres. Find its focal length?

Explanation:-

given:

Power = +2.5 D

solution:

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

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

therefore, Correct answer is option d

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