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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

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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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