Page 92 - ScienceStd4

Experiment 5: Investigating interaction of light rays with

surfaces of various objects

Aim: To demonstrate the ability of different objects to
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allow light to pass through

Materials: Torch, battery, empty glass, black plastic cup,

white cloth, piece of eye glass, piece of wood,
glass of water and a book

Procedure

1. Take a torch, load the battery, and turn it on to check if it
emits light.

2. Enter a dark room with the flashlight on. Arrange the listed

items on a table.

3. Direct the torch on the book and record your observations.

4. Repeat step 3 with the other items listed above.

5. Record the results for each item based on the following
questions:

(a) Which items allowed light rays to pass through?

(b) Which items did not allow light rays to pass through?

(c) What happened to the light when it struck the surfaces

of these items?

Results

An empty glass and a pair of eye glasses allow rays to pass
through. A white cloth and a glass full of water will allow some
light to pass through, while a black plastic cup, a piece of wood
and a book will not allow light rays to pass.

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SCIENCE AND TECHNOLOGY STD 4.indd 85 14/01/2025 18:38