Question

Two lenses one convex with focal length 0.5m and the other concave with focal length of 1.0m are combined. What will be the overall power of the combined lenses?

Answer 1

Answer:

the overall power will be the sum of the power of both lenses separately and P=1/F

Explanation:

apply the formula and this formula is applicable only when there is no separation between both lenses......

hoping it will help you.some work has been left for u.,sorry for it.

Answer 2

Answer:

P = 1 / f (in metres)

1) Convex Lens = f = + 0.5m

P = 1 / 0.5 = 2D

2) Cocave Lens = f = -1 m

P = 1/ -1 = 1

Total Power = P1 + p2 = 2 + 1 = 3D

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