Position of a shadow

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The areas where the shadows overlap are completely dark.

Compare your graph with our solution. In the point, where the two shadows overlap, it is completely dark because no light reaches that point. This point is called umbra. You can also observe lighter shadow areas. These areas are only hit by the light of one candle but not the other. Therefore, this area is called penumbra.

You can clearly see the difference between umbra and penumbra in the picture below.

Additionally you can see that the two candles create a shadow on the other sides and on themselves (circular shape of the shadow).