1.

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?

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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