A glass slab of thickness `3cm` and refractive index `3//2` is placed on ink mark on a piece of paper. For a person looking at the mark at a distance `5.0 cm` above it, the distance of the mark will appear to be

A glass slab of thickness 3 cm and refractive index 3/2 is placed on ink mark on a piece of paper. For a person looking at the mark at a distance 2 cm above it, the distance of the mark will appear to be in cm

A glass slab (n - 1.5) of thickness 3.0 cm is placed on an ink spot. A person looks at it from a distance 5.0 cm above the ink spot. The distance of the spot will appear to be :

A glass slab of thickness 3cm and refractive index 1.5 is placed in front of a concave mirror of focal length 20cm. Where should a point object be placed if it is to image on to itself?

A glass slab of thickness 3cm and refractive index 1.5 is placed in front of a concave mirror of focal length 20cm. Where should a poing object be placed if it is to image on to itself?

A mark is made on the bottom of a vessel and over this mark, a glass slab to thickness 3.5 cm and refractive index (7)/(4) is placed. Now water (refractive inidex, (4)/(3)) is poured into the vessel so that the surface of water is 8 cm above the upper surface of the slab. Looking down of normally through the water, the apparent depth of the mark below the surface of water will be :