From which surface of a mirror-the polished surface or the silvered surface-does most of the light reflect?

Explain surface energy and surface tension.

Light from a point source in air falls on a spherical glass surface (n = 1.5 and radius of curvature = 20 cm). The distance of the light source from the glass surface is 100 cm. At what position the image is formed?

Light from a point source in air falls on a spherical glass surface (n = 1.5 and radius of curvature = 30 cm). The distance of the light source from the glass surface is 12 cm. At what position the image is formed

If the magnitude acceleration of gravity on the surface of earth is g, then at height from the surface equal to the radius of earth what will be the magnitude of g?

Find the later surface area and total surface area of the following right prisms.

A ray is incident on a glass sphere as shown.The opposite surface of the sphere is partially silvered .If the net deviation of the ray transmitted at the partially silvered surface is 1//3^(rd) of the net deviation suffered by the ray reflected at the partially silvered surface(after emerging out of the sphere).Find the refractive index of the sphere.

Assertion:- Images formed by TIR (Total internal reflection) are much brighter than formed by mirrors or lenses. Reason:- IN TIR, there is no loss of intensity while in case of reflection from mirrors or refraction from plane surfaces or lenses there is some loss of intensity as all light can never be reflected or refracted.