Question

Two lenses of +2D and -3D are placed in contact with each other. What is the power of
resulting lens? What is the focal length? Will the combination behave like a convex or a
concave lens​

Answer 1

Answer:

Resulting power of the lens is=2D+(-3D) =-1D

Focal Length =1/D=1/-1=-1

It behaves like a concave lens.

Answer 2

Answer:

its resulting power is -1 dioptre.And his focal length is -1 m.

Explanation:

P = p1+p2

= +2+(-3)

= 2-3

= -1 D.

P = 1/f

-1 = 1/f

f = +1 m.