Question

Two lenses have power of (A) +2D (B) -4 D What is the nature and focal length of each lens?

Answer 1

Answer:

Solution

f = 1 / p

P1 = +2D => f 1 = 0.5m = 50cm

since f is positive, it is convex lens.

P2 = -4D => f 2 = -0.25m = -25cm

since f is negative, it is concave lens.

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