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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 figure.


Question ImageWho will be able to see the candle flame clearly?

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a

A

b

B

c

C

d

D 

answer is D.

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Detailed Solution

Student D is able to see the candle flame clearly.
Light always follows a straight path. In that case, you can clearly see the candle flame D. In other cases, because the pipes are not straight, the light is reflected and absorbed.
A, B, and C took a look through the crooked pipes. We know that light travels in a straight line because D only looked through the straight pipe.
 
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