Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in Fig. 11.4.
Who will be able to see the candle flame clearly?
The light always travels in the straight line. Hence if tubes are straight than the student will be able to see the light.
● Option (a) : the tube in option (a) is not straight. Therefore we will not be able to see the candle flame clearly.
● Option (b) : the tube in the given option is curved. Therefore we will not be able to see the candle flame clearly. Hence the option (b) is incorrect.
● Option (c) : the tube in option (c) is bent. Therefore we will not be able to see the candle flame clearly.
● Option (d) : the tube in option (a) is straight. Therefore we will be able to see the candle flame clearly. Hence the correct answer is (d)