Question

if the image formed by ta lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer .If the numerical value of the power of this lens is 10D, what is its focal length in the cartesian system

Answer 1

Lense is Concave lens.
Focal Length =1/Power
=1/10=0.1m