Observe the diagrams (i) and (ii) shown below.

→ In Figure (i), a boy is looking at a candle flame through a straight pipe.
→ In Figure (ii), the candle flame is viewed through a bent pipe.
(a) Explain why the candle flame is visible through a straight pipe but not through a bent pipe.
(b) If a mirror is placed at the bend of the pipe in the second setup, can the candle flame be seen? Justify your answer with a scientific explanation.