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CBSE Class 10 Answered

How to know that the given focal length/dictance is positive or negative
Asked by | 24 Feb, 2008, 11:30: AM
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 | 07 Dec, 2017, 03:48: PM

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