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How to know that the given focal length/dictance is positive or negative

Asked by 24th February 2008, 11:30 AM
Answered by Expert
Answer:

How to know that the given focal length/dictance is positive or negative.

It will give in the question that the mirror is concave/convex or lens is convex/concave.

The focal length of Concave mirror/Concave lens is negative while the focal length of convex mirror/convex lens is positive as per the New Sign Cartesian convention.

Rgds

Physics Expert

Answered by Expert 7th December 2017, 3:48 PM
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