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Write short note on power of a lens. |
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Answer» The power of a lens is DEFINED as the RECIPROCAL of the FOCAL length. Lens power is measured in DIOPTRES (D). Converging (convex ) lenses have POSITIVE focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values...Follow me...Bro.. |
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