ACTIVITY 2
Place a lighted candle on a table. Take a drinking
straw. Close one eye and look at the candle flame
through the straw from the other eye. The flame is
clearly visible [Fig. 5.11 (a)].
Straight straw
Light is seen
Lighted
candle
Na light is seen
Lighted
candle
Fig. 5.11 To show the rectilinear
propagation of light
Now bend the straw in the middle and
again look at the candle flame through the straw
[Fig. 5.11 (b)]. The flame is not visible now. The
reason is that light travels in a straight line path
When the straw is bent, the light of the candle flame
does not reach our eye.
Conclusion: Light travels in a straight line path
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