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a slab of thickness 5cm and refractive index 1.5 is held a few cm in ront of concave mirror of radius of curvature 40cm. THe faces of slab being perpendicular to principal axis of mirror. how far from mirror must a smaall object be placed if its reflected image coincides with the object?

a slab of thickness 5cm and refractive index 1.5 is held a few cm in ront of concave mirror of radius of curvature 40cm. THe faces of slab being perpendicular to principal axis of mirror. how far from mirror must a smaall object be placed if its reflected image coincides with the object?

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