A spot is placed on the bottom of a slab made of transperent material of refractive index 1.5. The spot is viewed vertically from the top when it seems to be raised by 2 cm. Then, the height of the slab is

A postage stamp kept below arectangular glass slab of refractive index 1*5 when viewed from vertically above it, appears to be raised by 7*0mm . Calculate the thickness of the glass slab.

A point source S is placed at the bottom of a tranparent block of height 10mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is

A ray of light 10^(-9) second to cross a glass slab of refractive index 1.5. The thickness of the slab will be

A ray of light 10^(-9) second to cross a glass slab of refractive index 1.5. The thickness of the slab will be

A microscope is focussed on a point object, and then its objective is raised through a height of 2cm when a glass slab of refractive index 1.5 is placed over this point object such that it is focussed again. The thickness of the glass slab is

A small ink dot on a paper is seen through s glass slab of thickness 4 cm and refractive index 1.5 . The dot appears to be raised by