When a glass slab is placed on a cross made on a sheet, the cross appears to be raised by `1cm`. The thickness of the glass is `3cm`. The critical angle for glass is

A plane glass slab is placed over various coloured letters. The letter which appears to be raised the least is

When a glass slab is placed on a dot on a paper.It apperas displaced by 4 cm viewed normally.What is the thickness of slab if the refractive index 1.5 .

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 travelling microscope is focussed on a mark made on a paper. When a slab of 1.45cm thickness is placed on the marl, the microscope has to be raised through 0.49 cm to focus the mark again. Calculate the refractive index of glass.

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.