A student investigates the refraction of light. Refraction is the change in direction of a ray of light when passing into a transparent substance, as shown in Fig. 4.1. Plan an experiment which enables him to investigate how the concentration of a gel affects the angle at which light is refracted when passing from air into the gel. A transparent gel block can be made by dissolving gel powder in hot water in a mould and allowing it to cool. Changing the amount of powder will change the concentration. Concentration is measured in $$\(\mathrm{g} / \mathrm{cm}^{3}\)$$. The apparatus available includes: - samples of gel made at different concentrations and labelled with those concentrations - a ray-lamp which produces a narrow ray of light. In your plan: - list any additional apparatus needed - explain briefly how to do the experiment, including the measurements to take - state the key variable to keep constant - draw a table, or tables, with column headings, to show how to display the readings (you are not required to enter any readings in the table) - explain how to use the readings to reach a conclusion. Fig. 4.1

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