. 1. A fire in water. The candle is kept in front of a plane glass sheet. The glass forms one side of a card board box. Inside that there is a glass of water. Light from the candle will get reflected by the smooth glass but some rays will pass through to illuminate the water. From the position of the man, he will see as if a candle is burning inside water.
Fig. Candle burning in water.
Explanation. The glass produces an upright virtual, image inside the box. This will be clearly visible as box is dark. The man will see this and think it’s the real candle. The real candle is hidden behind the board.
2. Be a Spy. Periscope:-This is an application of reflection. Fig. A good way to observe birds. Two mirrors shown in blue reflects the light to Nelly's eye.
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