David Sang Solutions for Chapter: Light, Exercise 8: End-of-chapter questions

Draw a diagram to show how a ray of light is reflected by a plane mirror. Mark the normal and the angles of incidence and reflection. 

Write an equation that shows how angle of reflection and angle of incidence are related by the law of reflection. Write the equation both in words and in symbols. 

Draw a diagram to show how a ray of light is refracted when it passes from one material to another. Mark the normal and the angles of incidence and refraction.

Write an equation relating the refractive index of a material to the speed of light in vacuum and the speed of light in the material.

Here is the equation for Snell's law: $n=\frac{\sin \left(i\right)}{\sin \left(r\right)}$. Copy the equation and state what the symbols $n,i,r$ stands for.

Draw a diagram to show how a ray of light is refracted when it strikes the internal surface of piece of glass at an angle smaller than the critical angle. Label incident, refracted and reflected rays.

Draw a diagram to show how a converging lens causes parallel rays of light to be focussed. 

The law of reflection says that : "When a ray of light is reflected at a surface, the angle of incidence is equal to the angle of reflection". Draw a diagram to indicate how a ray of light is reflected by a flat mirror, and mark the two angles mentioned in the law.