Refraction - Core Practical

Normal - perpendicular to the surface of the glass block where the ray enters or leaves the glass block

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1. Place a glass block on a piece of paper
2. Shine a ray of light into the glass block using a ray box
3. Draw a line on each side of the block where the ray is
4. Join up the lines with a pencil
5. Draw the normal perpendicular to where the ray enters the block
6. Measure the angle of incidence and angle of refraction using a protractor
7. Do the same at the point where the ray emerges from the block
8. Repeat 3 times and calculate an average to improve accuracy

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