Page 62 - Science Class 6 Times Publication

2. Make a hole in each of them at the same height.

3. Erect the boards vertically using holders in such a way that
all the holes are at the same height and in a straight line.

4. Light a candle and place it in front of the card board of one end
so that the burning of candle can be seen through the hole.
5. Adjust eye near the card board of another end and look
through the hole. You can see the burning candle.
6. Move the central cardboard slightly so that its hole is not in
the straight line with the others. What do you observe?

Observation: When the holes of card board are in the same straight
line, the burning of candle can be observed from another end. But if
the central card board is move a little up ward, the burning of candle
cannot be seen.

Conclusion: Light always passes along a straight line. This
phenomenon is called rectilinear propagation of light.
Main Points to Remember

1. Light is a form of energy that gives the sensation of vision.

2. The bodies which emit light of their own are called luminous
bodies.
3. The bodies which do not emit light of their own but become

Times' Crucial Science and Environment 58 Book 6