A hollow sphere of glass of inner and outer radii R and 2R respectively has a small mark on its inner surface. This mark is observed from a point outside the sphere such that the centre of the sphere lies in between. Prove that the mark will appear nearer than it really it, by a distance `(mu-1)(R)//(3mu-1)`

A hollow sphere made of a transparent material of refractive index 1.5 has a small mark on its surface as shown. The mark is observed from the farther side. Find the distance of the image of mark from the centre of the sphere.

A hollow sphere made of a transparent material of refractive index 1.5 has a small mark on its surface as shown. The mark is observed from the farther side. Find the distance of the image of mark from the centre of the sphere.

A hollow sphere of glass of R.I .n has small mark M on its interior surface which is observed by an observer O from a point outside the sphere, .C is centre of the sphere. The inner cavity (air) is concentric with the external surface and thickness of the glass is every where equal to the radius of the inner surface. Find the distance by which the mark will appear nearer than it really is in terms of n and R assuming paraxial rays.

A hollow sphere of glass of R.I .n has small mark M on its interior surface which is observed by an observer O from a point outside the sphere, .C is centre of the sphere. The inner cavity (air) is concentric with the external surface and thickness of the glass is every where equal to the radius of the inner surface. Find the distance by which the mark will appear nearer than it really is in terms of n and R assuming paraxial rays.

A hollow dielectric sphere has inner and outer radii of R_1 and R_2 respectively. The total charge carried by the sphere is +Q, this charge being uniformly distributed through out the dielectric sphere between R_1 and R_2 .

The inner and outer radii of a spherical capacitor are r_1 and r_2 respectively. When the inner surface is earthed . The outer sphere is given a charge +Q , then the charge on the inner surface is

A hollow conducting sphere of inner radius r and outer radius 2R is given charge Q as shown in figure, then the

A hollow metallic sphere has inner and outer radii, respectively as 5 cm and 10 cm if the mass of the sphere is 2.5 kg, find (a) density of the material, (b) relative density of the material of the sphere.