Question

The power of concave lens is___​

Answer 1

Explanation:

Concave lens surfaces have a virtual and therefore negative radius of curvature. The convention signs used for focal length are also used for optical power. Convex lenses, which have a real focus, have a positive focal length and optical power. Concave lenses, with a virtual focus, have a negative focal length and optical power.

Answer 2

Answer:

virtual image

Explanation:

when an object is placed atha finite distance froms the lens a virtual image is formed between optical centre and focus of the concave lens