Question

find the point of a concave lens of focal length 2 cm​

Answer 1

Answer:

Since it is a concave lens so the focal length of a concave lens is considered negative.

Thus,

Focal length f = -2cm= -2/100= -0.02cm

Power= 1/f(in m)

          = 1/-0.02

          = -50 dioptres.

Answer 2

We know that P=1/f

=1/2

=0.5diopter