A transparent cube contains a small air bubble. Its apparent distance is 2 cm when seen through other facel. If the refractive index of the material of the cube is 1.5, the real length of the edge of cube must be

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is

A beam of light rays converges to a point O (x = 0) on x-axis as shown. The angle of convergence is small. A cube of glass of refractive index mu = 1.5 and side length 40 cm containing a

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