Drag an object along the principal axis of a concave or convex mirror and watch the image form in real time. Four colour-coded construction rays (parallel→F, through F, through C, and the pole ray) are traced onto the curved surface, with dashed extensions behind the mirror whenever the image is virtual. The panel reports u, v, f, R and m in the new Cartesian sign convention, shows the mirror formula worked out step by step, and highlights the matching row of the NCERT image-formation table as you drag.
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