A sphere `(mu=4/3)` of radius `1 m` has a small cavity of diameter `1 cm` at its centre. An observer who is looking at it from tight, sees the magnification of diameter of the cavity as

A metallic sphere of diameter D has a cavity of diameter d at its centre. If the sphere is heated, the diameter of the cavity will:

A glass sphere of radius 5 cm has a small bubble at a distance 2 cm from its centre. The bubble is viewed along a Diameter of the sphere from the side on which it lies.How far from the surface will it appear.Refractive index of glass is 1.5 2.5 cm behind the surface

A glass sphere of radius 5 cm has a small bubble at a distance 2 cm from its centre.The bubble is viewed along a Diameter of the sphere from the side on which it lies.How far from the surface will it appear.Refractive index of glass is 1.5 2.5 cm behind the surface

A glass sphere (mu=1.5) of radius 20 cm has a small air bubble 4 cm below its centre. The sphere is viewed from outside and along a vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is (in cm)

A glass sphere of radius 15 cm has a small bubble 6 cm from its centre. The bubble is viewed along a diameter of the sphere from the side on which it lies. How for from the surface will it appear to be if the refractive index of glass is 1.5 ?

A glass sphere ( mu =1.5) of radius 20 cm has small air bubble 4 cm below its centre. The sphere is viewed from outside and along vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is (in cm)