Answers

  • Brainly User
2014-12-29T20:15:38+05:30
It's obvious from the relation,\frac{1}{v}-\frac{1}{u}=\frac{1}{f}, focal length is 20cm. Actually, -20cm to be more appropriate, according to the sign convention and all.
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Distance from optical centre to focus is called focal length.
i know that but how these things are related to this numerical
by applyong which formula u have got this answer?
I've edited it. You can see the formula, right?
but we are given only v = -20cm in this question
2015-01-01T21:12:27+05:30
It's obvious from the relation,, focal length is 20cm. Actually, -20cm to be more appropriate, according to the sign convention and over all.
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