Question

the power of lens is +2.0 d. find its focal length and (kind of lens is Convex lens Why).​

Answer 1

Power of lens = +2D

Power is positive, ∴ the lens is convex

Let focal length be F

Power = 1/F

2 = 1/F

F = 1/2 m

F = 0.5m

Focal length is 0.5m and the lens is convex

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