Question

if the image formed by a lens for all position of the object placed in front of it is always virtual erect and diminished state the type of the lens draw a ray diagram in support of your answer if the numerical value of focal length of such a lens is 20 cm find its power in new Cartesian sign conventions .​

Answer 1

Answer:

the lens is convex mirror.

if the focal length is 20 cm then power of the lens will be

p=1/f

where power is +5 dioptre