Question

Find the focal length of a lens of power _2D .what type of lens is this?

Answer 1

Hii frnd.
As we know
Power =1/f(in m)
2=1/f
f=1/2 m
It is a convex lens as f is positive
Hope it helped u!

Answer 2

Answer: Convex lens

Explanation: By question, f = -2D

Minus sign (-ve) represents that it is a real and inverted image. So, we know that a real and inverted image can be obtained from convex lens only (in the case of lens).

I hope my answer will be helpful for you.