1. 14.1 Bending of light Determining the refractive index of glass In an experiment, a ray of light is directed towards a semi-circular glass block at various angles of incidence. The following table shows the results obtained. Example 1 i r air glass normal Angle of incidence i 00 15  30  45  60  75  Angle of refraction r 00 99 18  26  33  40 

2. 14.1 Bending of light (a) Plot a graph of sin i against sin r. How are sin i and sin r related? sin i sin r 00.050.10.150.20.250.30.350.40.450.50.550.60.65 0.2 0.4 0.6 0.8 1 sin i sin r (a) 0 0 0.259 0.156 0.500 0.309 0.707 0.438 0.866 0.545 0.966 0.643

3. 14.1 Bending of light (b) From the graph in (a), find the refractive index of the glass. (b)  1.55 As the graph is a straight line that passes through the origin, sin i is directly proportional to sin r.  slope of the graph refractive index of the glass