# If focal length of a convex lens is 20 cm at what is the power of the lens? - Science and Technology 1

Numerical

If focal length of a convex lens is 20 cm at what is the power of the lens?

#### Solution

Given: Focal length (f ) = 20 cm = 0.2 m

To find: Power of the lens (P)

Formula: P = 1/("f"("m"))

Calculation: From formula, P = 1/0.2 = 5 D

The power of the convex lens is 5 D.

Concept: Power of a Lens
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