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Spherical Mirror

But the focal...

Question

But the focal length of convex mirror is given positive but in some problems we take it as positive. Why?

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Solution

Under the rules of sign convention the focal length of a convex mirror will always be taken as a positive. This is because the focal point is formed on the right side of the mirror (or the positive x-axis).

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Similar questions

Why focal length of convex mirror and convex lens is positive while concave mirror and concave lens negative?

Q. According to New Cartesian Sign Convention:

(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive

Q. As per the sign conventions, the focal length of a convex mirror is taken as positive.

Q. Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances. Reason: If image distance of a real object in front of a convex mirror is taken as negative, then the focal length of a convex mirror is taken as positive.

Q. Assertion :Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. Reason: It depends on the sign convention chosen.

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