Answer-
According to the question, Power of the lens (P) is
P = -2D
And the expression for the power of the lens is P = 1/f
So, we get => f = -1/2
f = -0.5 m
As it has a negative focal length. Therefore, it is a concave lens.
Answer-
According to the question, Power of the lens (P) is
P = -2D
And the expression for the power of the lens is P = 1/f
So, we get => f = -1/2
f = -0.5 m
As it has a negative focal length. Therefore, it is a concave lens.