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A point object is placed on principal ax...

A point object is placed on principal axis of a concave mirror of radius of curvature `20 cm` at a distance `31 cm` from poll of the mirror. `A` glass slab of thikness `3 cm` and refractive index `1.5` is placed between object and mirror as shown in the figure. Find the distance (in `cm`) of final image formed by the system from the mirror.

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