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2015-11-02T14:47:00+05:30

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Sign is always taken -(negative) from pole of spherical mirror to the object along the principle axis.This means sign is - in front of the mirror. And likewise its positive behind the spherical mirror.
-regards ( queries will be entertained )
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2015-11-02T16:30:48+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
   It is the sign convention adopted for expressing one relationship among the physical quantities f, u and v.  The convention allows an easy and one formula for both convex and concave mirrors.

   Quantities are positive if measured in the direction of the light rays emanating from the object (real or virtual).

   Quantities are negative if measured in the opposite direction.

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