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define principal focus of a convex concave mirror define the principal axis of a convex concave mirror what is the principal focus of a convex concave mirror define the principal focus of a convex and concave mirror with neat diagram define principal focus of a concave mirror and convex lens define principal focus of concave and convex mirror class 10 define the principal focus of convex mirror and concave mirror with its ray diagram define principal focus of a concave mirror write two uses of convex mirror define the principal focus and focal length of a concave and convex mirror define principal focus of a convex mirror
