#### Question

A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

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#### Solution

Power of lens, *P*= 1/*f**P*= 1.5D*f*= 1/1.5 = 10/15 = 0.66 m

A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.

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#### Reference Material

Solution for question: Find the Focal Length of the Lens. is the Prescribed Lens Diverging Or Converging? concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens. For the course CBSE