Copy the diagram given below and complete the path of light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary.

State the dependence of angle of deviation :

(i) On the refractive index of the material of the prism.

(ii) On the wavelength of light.

State two ways by which the frequency of transverse vibrations of a stretched string can be increased.

What is meant by noise pollution? Name one source of sound causing noise pollution.