A point luminous object (O) is at a distance h from front face of a glass slab of width d and of refractive index 
.On the back face of slab is a reflecting plane mirror. An observer sees the image of object in mirror as shown in figure. Distance of image from front face as seen by observer will be:
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: As shown in figure glass slab will form the image of bottom i.e., mirror MM’ at a depth 
from its front face. So the distance of object O from virtual mirror mm’ will be 
Now as a plane mirror forms image behind the mirror at the same distance as the object is in front of it, the distance of image I from mm’ will b 
and as the distance of virtual mirror from the front face of slab is 
the distance of image I from front face as seen by observer will be
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