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# The Optician'S Prescription for a Spectacle Lens is Marked +0.5 D. What is the : (A) Nature of Spectacle Lens? (B) Focal Length of Spectacle Lens? - CBSE Class 10 - Science

ConceptRefraction at Spherical Surfaces and by Lenses Power of a Lens

#### Question

The optician's prescription for a spectacle lens is marked +0.5 D. What is the :
(a) nature of spectacle lens?
(b) focal length of spectacle lens?

#### Solution

Positive power indicates it is a converging lens.

Power of a lens is given by:

power(p)=1/f

0.5=1/f

f=1/0.5

f=2m

Is there an error in this question or solution?

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Solution The Optician'S Prescription for a Spectacle Lens is Marked +0.5 D. What is the : (A) Nature of Spectacle Lens? (B) Focal Length of Spectacle Lens? Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens.
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