#### Question

The focal length of a lens is +150 mm. What kind of lens is it and what is its power?

#### Solution

Power of a lens is given by:

Power (*P*) `=1/f`

`p='1/(150xx10^-3)=6.67 D`

Since the power is positive, the lens is convex in nature.

Is there an error in this question or solution?

Solution The Focal Length of a Lens is +150 Mm. What Kind of Lens is It and What is Its Power? Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens.