Required practicles

• RP09 - Light

  1. Slot the slit into the ray box and turn on, producing a narrow ray of light.

  2. Place the first block of material on top of a piece of paper. Trace around the block using a pencil.

  3. Draw a normal to the block (a line at 90° to the surface of the block). Align the incident ray of light with the meeting point between the normal and the surface of the block.

  4. Draw the reflected ray and refracted ray, as shown in the diagram below. Remove the block and draw a straight line between the point of reflection and the refracted ray on the other side of the block.

  5. Using the protractor, measure:

  a. The angle of incidence - The angle between the incident ray and the normal.

  b. The angle of reflection - The angle between the reflected ray and the normal.

  c. The angle of refraction - The angle within the material between the normal and the refracted ray.

  6. Repeat the experiment, using a new piece of paper for each different material of block.
• RP10 - Radiation and Absorption

  1. Align the infrared detector with one side of the Leslie Cube, 20cm away from the side, and take the initial temperature of the surface.

  2. Heat one side of the Leslie Cube by pouring hot water into the Leslie Cube.

  3. Measure and record the temperature of the surface every 30s for five minutes using infrared detector

  4. Rotate the cube and repeat the experiment for a different surface.

  5. Plot temperature (plot on y-axis, measured in °C) against time (plot on x-axis, measured in seconds) for each different surface.