Experimental demonstration:
- Place a rectangular glass block in the middle of a sheet of white paper and draw around it to record its position.
- Direct, with a ray box, a ray of light at the midpoint of one of the long sides of the block and observe the refracted ray passing through the block.
- Mark with a pencil some points on where it hits the block and where it leaves the block.
- Remove the block and draw straight lines connecting the points; the line will show the path of the ray.
- Mark the angles, measure them and record their values.
- Repeat the experiment for 3 or 4 more values of the angle of i, and record the results in a table.
- Calculate the value of sin sin i/sin r for each value of i.
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