Question

Two thin lenses of power +2d and -1.5d are placed in contact. Find the power and focal length of the combination of the lenses

Answer 1

Answer:

Power = +0.5 D

Focal length of combination = +2m

Explanation:

Power = P1 + P2

= 2D+(-1.5D)

= 0.5 D

Focal length = 1/Power

= 1/0.5 m

= 2 m