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Define the power of a lens. What is the meaning of “The power of a lens is 1 diaptor” If the power a of a lens is -2.0 D, then what type of lens is that? When an object is kept at infinity from this type of lens, what is the size of the image formed? |
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Answer» The power of a lens is defined as the reciprocal of its focal length it is represented by the letter R. 1 Diaptor is the power of a lens whose focal length is 1 metre 1D = 1M-1. If the power of a law is -2.0D then the type of lens is concave. The size of the image is highly diminished point sized. |
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