Power P (in Diopters) = 1/f (in meters). A positive power indicates a convex (converging) lens, and a negative power indicates a concave (diverging) lens.
The power of a lens is +2.0D. The focal length of the lens and its nature are
Asked in WBPSC CS Prelims 2021 · Topic: Optics (Thin and Thick Lenses, lens combinations)
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