Question

State the postulates of Cartesian sign convention used for reflection by spherical mirrors​

Answer 1

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• All distances should be measured from the pole. The distances measured in the direction of incident light, to be taken positive and measured in the opposite direction of incident light to be taken negative.
• The new Cartesian sign convention is same as that for spherical mirrors.
• The difference is that the distances are measured from the optical centre.
• According to the sign convention, the focal length of a convex lens is positive and that of a concave lens is negative.

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