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Find the power of a convex lens that forms a real & inverted image of magnification -1 of an object placed at a distance of 20 cm from its optical center?
Asked by pwsaditya | 15 Jul, 2021, 05:02: PM
Expert Answer
If the magnification is -1 for a convex lens, then lens-to-object distance is 2f , where f is focal length of lens
Hence , 2f = 20 cm or f = 10 cm = 0.1 m
Power of lens = 1/f = 1/0.1 = +10
(In Power of lens formula , focal length f should be in metre )
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