1. Refraction of Light

2. Definition The bending of light as it travels from one medium to another medium of different optical density

3. Optical Density, n Higher the optical density, the slower the speed of light travelling through it

4. Refraction – the bending of light Incident ray: light ray in the 1 st medium Refracted ray: light ray in the 2 nd medium Angle of incidence: the angle between the incident ray and normal Angle of refraction: the angle between the refracted ray and normal

5. Facts about refraction Light bends towards the normal when it enters an optically denser medium (n2>n1) Light bends away from the normal when it enters an optically less dense medium (n2<n1)

6. Facts about refraction Light travelling along the normal does not bend away from its original path

7.  sin i is directly proportional to sin r. sin i sin r O Relation between angle of incidence and angle of refraction i = angle of incidence r = angle of refraction straight line passing through the origin

8. Task Now, carry out the activity to find out the formula which shows the relationship between angle of incidence and angle of refraction Open the following website and follow the instructions on the worksheet given before carrying out the task.