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 | 15th 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 )

Answered by Thiyagarajan K | 15th Jul, 2021, 07:46: PM

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