Lab Work

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Equipment: ● Glass blocks (rectangular, semi-circular and triangular) ● Power supply ● Ray box with a single slit ● Protractor ● Paper Method: 1. Connect the ray box to the power supply and insert the single slit slide so that it produces a clear and thin beam of light. 2. Place one of the blocks onto the sheet of paper and draw around it. 3. Remove the block and then mark the position on the outline that you are going to shine the light ray at with a cross. 4. Using a protractor, draw a normal to that point (a perpendicular line). 5. Mark on a selection of different angles of incidence by measuring angles from the normal line. 6. Replace the block on top of the outline, and then shine the ray of light along each incident line. For each angle, mark the position on the other side of the block where the light exits. 7. Turn off the ray box and remove the block. 8. Using a ruler, connect up the entry position and the exit position for each angle of incidence. 9. Using a protractor, measure the angles of refraction (the angles that the lines inside the block outline make with the normal) for the different angles of incidence. 10. Repeat for the other two shaped blocks and compare results. Tips: ● To ensure you can see the light rays clearly, it may help to work in a darkened laboratory. ● Use a sharp pencil so that the lines are clear and the angle measurements are as accurate as possible. Safety Precautions: ● The ray box will get very hot so avoid touching any metal surfaces during and just after use. ● Turn the ray box off when not in use to prevent it overheating. ● Don’t look directly at the ray box light.