The New Cartesion Sign Convention for Lenses

State and explain the New Cartesian Sign Convention for spherical lenses.

According to the "New Cartesian Sign Convention" for mirros, when sigh has been given to the focal length of : (i) a concave mirror ? (ii) a convex mirror ?

Convention of Signs

Uses Of Concave Mirrors|Image Formation By A Convex Mirror |Uses Of Convex Mirrors|New Cartesian Sign Convention For Reflection By Spherical Mirrors|Mirror Formula|Magnification (m)|Exercise Questions|OMR

New Cartesian Sign Convention|Rules To Know|Important Points To Remember|Practice Exercise|Summary

What is the Cartesian sign convention used for spherical mirrors ?