Sign Convention Trick For All Mirrors(Plane & Spherical) and All lenses(Concave &convex)

Sign Convention is important topic of Light(Optics). Without knowledge of sign convention Numerical & Derivation can't be solved.In this video I have tried to explain Tricks for the this.Single video for all mirrors and lenses.Hope this will help students of class 10th and 12th and others.

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