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Light Properties Investigation

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Light Properties Investigation

A community theatre in Aotearoa needs to know which materials will make a safe, useful screen. Use the evidence and investigation plan below to explain how light behaves. For the practical task, use a torch and materials only with adult permission; never shine a torch into anyone’s eyes or look directly at the Sun.

Plan a fair test

Question: How does the type of material affect how much light reaches the other side? Keep the torch distance and angle, room lighting, and detector position the same. Change only the material. Measure brightness with a light meter app if available, or use a consistent observation scale: 0 = none, 1 = faint, 2 = medium, 3 = bright.

1.Which statement is the best testable prediction for this investigation?

All materials will let through the same amount of light.
Clear plastic will let through more light than cardboard because it is transparent.
The torch will become brighter when it shines at cardboard.
Materials with different names will always have different colours.

2.Identify the independent variable and the dependent variable in the test.

3.Name two conditions that should be kept the same to make this a fair test.

Read the evidence

A group carried out three trials for each sample. Their torch, distances and room lighting stayed the same. They used a light meter reading in arbitrary units.

Material

Trial 1

Trial 2

Trial 3

Clear plastic

Frosted plastic

Cardboard

4.Calculate the mean light reading for clear plastic. Show or explain your calculation.

5.Which sample was translucent? Use a result from the table to support your answer.

6.True or false: The cardboard readings show that no light passed through at all. Explain your choice.

7.Match each term to the description that fits it.

Transparent
Translucent
Opaque
Reflection

Light bounces off a surface
Lets most light pass through, so objects can be seen clearly
Lets some light through but scatters it
Does not let light pass through; it can form a shadow

8.Use the ray diagram idea: when a beam hits a flat mirror, what happens to the light?

9.The theatre wants a screen that lets light through but blurs the image behind it. Which tested material is the best choice? Give evidence.

Improve the investigation

Think like a scientist: results are stronger when measurements are repeated, variables are controlled and conclusions are limited to the evidence.

10.Why did the group take three readings for each material instead of just one?

11.Suggest one improvement that would make the light readings more reliable, and explain how it helps.

12.A classmate says, “This test proves every clear material always transmits more light than every frosted material.” Is that conclusion justified? Explain using the investigation.