Two candles are placed equal distances in front of and behind a sheet of glass. Since the glass partially reflects and partially transmits light, you can "look through" the glass to line the candles up with each other.
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When one candle is lit,
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the second candle "appears to burn" when the observer looks through the glass.
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This ray diagram shows how the "eye" sees the virtual image of the burning candle's flame.
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