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Q.

Four students, A, B, C, and D, looked through pipes of different shapes to see a candle flame, as shown in the figure. In which of the following light will travel?

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a

A

b

B

c

C

d

D

answer is D.

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Detailed Solution

Light will travel in

D

.
The light can only travel in a straight line, and therefore pipe D is a straight pipe. It can only allow light to pass through it, and we can see it. Light cannot follow the curved paths because if it follows the curved part, there is a light bending. As A, B and C are curved paths so the light will not travel A, B and C.

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Four students, A, B, C, and D, looked through pipes of different shapes to see a candle flame, as shown in the figure. In which of the following light will travel?