![]() ![]() Draw in the incident rays corresponding to these angles and label them A, B, C. Use a protractor to measure angles of incidence from this normal of 10 0, 20 0, 30 0, 40 0, 50 0, 60 0 and 70 0.Use the protractor to draw a normal approximately 1/3 of the way along the longest side. Place the rectangular glass block on a sheet of white paper and draw around it carefully with a pencil.Set up the ray box and slit so that a narrow, bright ray of light is produced. ![]() Low voltage power pack, a 12V ray box, a single slit comb, a rectangular glass block, a sheet of white paper, a protractor, a sharp pencil. However, as the angle of incidence increases the refracted light will bend from a bigger initial angle, and so the angle of refraction will also be bigger. Light is travelling from air to glass and so is refracted towards the normal. ![]() Remember - these variables are controlled (or kept the same) because to make it a fair test, only 1 variable can be changed, which in this case is the angle of incidence. Independent Variable is the angle of incidence.ĭependent Variable is the angle of refraction.Ĭontrol Variables are the material of the block, the shape of the block and the colour of the light. observe and use a protractor to measure angles of refraction.make, measure and record the angles of incidence accurately using a protractor.In this required practical activity, it is important to: There are different ways to investigate refraction in rectangular blocks. and to use the measurements taken to plot a graph of angle of incidence against angle of refraction to show that they are related but not proportional.To demonstrate understanding that the angles of incidence and refraction are measured from a line at right angles to the glass surface known as the normal.To use ray tracing to measure the angles of incidence and refraction when light is refracted by a glass block.A guide to carrying out a practical investigating angles of incidence and refraction ![]()
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