Q. An object is placed at from the upper face of a glass slab of thickness . The lower face of the slab is silvered as shown in the figure. If the refractive index of the material of slab is find the position of the image: Physics Question Image

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Solution:

image
For refraction at the first surface ab of the glass slab,




The image
will serve as an object for the plane mirror and its
virtual image is formed at at a distance behind the mirror. This image will serve as an object for the refracting surface ab for which
The final image is formed at a distance from the face ab.

or
or
or
Thus, the final image I is formed at a distance from the refracting face ab which means at a distance behind the silvered face .