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CBSE Class 10 Answered

A lens used as a magnifier gives magnification of 6.what is its power and focal lenght?
Asked by Shilpa Mehta | 10 Feb, 2011, 10:12: PM
answered-by-expert Expert Answer
Dear student
Magnification, m = v/u
or, m = 6 = v/u
i.e. v = 6u
We know that, 1/f = 1/v + 1/u ; putting the above value of v and u in this equation, you may find the focal length.
Once the focal length is known, power can be calculated as P = 1/ f (in m)
Hope this helps.
Regards
Team
Topperlearning
Answered by | 11 Feb, 2011, 09:37: AM
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