A small object is placed on the principal axis of concave spherical mirror of radius \( 20 \math...

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A small object is placed on the principal axis of concave spherical mirror of radius \( 20 \mathrm{~cm} \) at a distance of \( 30 \mathrm{~cm} \). By how much will the position of the image alter only after mirror, when a parallel-sided slab of glass of thickness \( 6 \mathrm{~cm} \) and refractive index \( 1.5 \) is introduced between the centre of curvature and the object? The parallel sides are perpendicular to the principal axis.
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