പ്രകാശം

EXPERIMENT Part 1 

EXPERIMENT Part 2

EXPERIMENT Part 3

EXPERIMENT Part 4

👉 Visal  can see the candle flame only if the holes of the cardboards are in a straight line. If one of the cardboards is displaced, the candle flame disappears, because the hole of that  cardboards is shifted from the straight line path.

👉 The reason is that can only along a straight line .