A slab of glass of refractive index 1.5 ...

A slab of glass of refractive index `1.5` and thickness `3cm` is placed with the faces perpendicular to the principle axis of a concave mirror. If the radius of curvature of the mirror is `10cm`, the distance at which an object must be placed from the mirror so that the image coincides with the object is

9 cm

10 cm

11 cm

12 cm

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