Explain why (a) The angle of contact of mercury with glass is obtuse , while of water with glass is acute .

The angle of contact between mercury and glass is ……. Angle

Explain angle of contact in the context of intermolecular forces.

Give reason why mercury does not wet glass .

A combination of two prisms, one of flint and other of crown glass produces dispersion without deviation. The angle of flint glass prism is 15^@ . Calculate the angle of crown glass prism and angular separation of red and violet rays on emergence from the spectroscope. ( mu for crown glass = 1.52, mu for flint glass = 1.65, omega for crown glass = 0.02, omega for flint glass = 0.03 ).

The angle of contact between drop of water and material of raincoat is acute angle.

A glass capillary tube is of the shape of a truncated cone with an apex angle alpha so that its two ends have cross sections of different radii. When dipped in water vertically, water rises in it to a high h, where the radius of its cross section is b. If the surface tension of water is S, its density if rho , and its contact angle with glass is theta , the value of h will be (g is the acceleration due to gravity)

A diverging beam of light from a point source S having devergence angle alpha , falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

Explain force polishing of glass ?

Figures (a) and (b) show refraction of a ray in air incident at 60^@ with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45^@ with the normal to a water-glass interface. Figure (c) .