Physics
Answer
Experiment :
Aim : To prove that light travels in a straight line
Materials Required : Three sheets of cardboards of same size, plasticine or clay and candle.
Procedure :
- Take the three cardboards and make a hole in the centre of each. Make sure that the size and position of the hole is same in each cardboard.
- Place the cardboards in vertical position on a table with the help of clay or plasticine in such a way that the holes in them are in a straight line.
- Light the candle and place it on the table in front of the cardboards as shown in the figure.
- Look through the hole of the last cardboard and observe.
- Now displace any one of the cardboards slightly and look through the hole of the last cardboard again and observe.
Observation :
- The flame of the candle can be seen clearly through the holes when all the three holes on cardboards are in straight line.
- We cannot see the flame if anyone of the cardboards are displaced.
Conclusion : Light always travels in a straight line.
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