Asked by dhairya | 4th May, 2009, 02:27: PM
You need to wear spectacles of negative power because you are suffering from myopia or short sightedness.You can see objects placed close by but find it difficult to see objects placed far away.
The negative power of the lens indicates that the lens that you wear is a concave lens. You can find its focal length using P =1/f where f is in m.
Answered by | 5th May, 2009, 10:44: AM
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