
Draw a ray diagram to illustrate the action of a convergent lens as reading glasses or a magnifying glass.

Important Questions on Practice Papers for Revision
A prism deviates a monochromatic ray of light through an angle when the angle of incidence at the surface of the prism is .
(i) Draw a graph showing the variation of with . On your graph, show the angle of minimum deviation?
(ii) A prism deviates a monochromatic ray of light through an angle when the angle of incidence at the surface of the prism is .
What is the relation between the angle of incidence and the angle of emergence when the ray suffers minimum deviation?

Two isosceles right angled prism are arranged as shown in the figure. Copy the diagram and complete the path of the ray AB along which it passes through the prisms and comes out. Name the phenomenon being displayed by the path of the ray in the given diagram.

The rearview mirror of a motor bike starts vibrating violently at some particular speed of the motor bike. Why does this happen?


The rearview mirror of a motor bike starts vibrating violently at some particular speed of the motor bike. What could be done to stop the violent vibrations ?


Define the terms: amplitude and frequency for sound waves.

