with repect to the type of lens or mirror used, when is the focal length taken negative or positive?
For ex:- if a concave lens has a focal length of 15 cm, will it be take positive or negative while using the lens formula?

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Solution

Focal length of a concave mirror and lens is negative while that of a convex mirror and lens is taken as positive.

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with repect to the type of lens or mirror used, when is the focal length taken negative or positive?For ex:- if a concave lens has a focal length of 15 cm, will it be take positive or negative while using the lens formula?

Focal length of a concave mirror and lens is negative while that of a convex mirror and lens is taken as positive.

with repect to the type of lens or mirror used, when is the focal length taken negative or positive?
For ex:- if a concave lens has a focal length of 15 cm, will it be take positive or negative while using the lens formula?