Page 93 - ScienceStd4

Conclusion

Transparent objects allow light to pass through, translucent
objects allow partial light and opaque objects block light
completely.
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Experiment 6: Investigating transfer of light in straight line

Aim: To demonstrate transfer of light in a straight line

Materials: A glass of water, opaque paper, two perforated
paper, torch and water
Procedure

1. Place the glass of water on a desk.

2. Position the perforated paper in front of the glass.

3. Place the opaque paper on the opposite side of the glass.

4. Direct the torch beam at the perforated paper as shown in

Figure 7. Can you see the light on the opaque paper?

Figure 7: How light travels
5. Replace the glass of water with a second perforated paper.

Ensure it is aligned with the first perforated paper. Record
your observations.

6. Slightly move one of the perforated papers, so that its

hole is no longer aligned with the beam. Record your
observations

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