1.the flame of the candle or other burning matter always towards upward direction.why?
2.when the photos is taking by looking to the camera and later when the photo printed, why the photo always seems to look at the direction wherever we move around to it?
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1. The flame of a candle or other burning matter always points upward due to a phenomenon called convection. Convection is the transfer of heat through the movement of a fluid or gas. In the case of a candle flame, the heat generated causes the air near the flame to become hot and less dense. This hot air rises, carrying the flame along with it. As a result, the flame points upward, opposite to the direction of gravity.
To understand this phenomenon better, you can conduct a simple experiment. Place a lit candle in a still room and observe the flame. Then, gently blow on one side of the flame. You'll notice that the flame leans in the direction of the air you blew, indicating the influence of airflow on the flame's direction.
2. When a photo is taken and later printed, the image appears to look at the direction from wherever we view it due to an optical illusion called the "Mona Lisa effect." This effect is named after Leonardo da Vinci's famous painting, the Mona Lisa, where the eyes of the subject appear to follow the viewer regardless of their position in relation to the painting.
This effect occurs because our brains are wired to interpret images in a way that maintains a sense of depth and perspective. When we view a photograph, our brain assumes that the subject is at the same depth as the photo itself. As we move around to different angles, our brain tries to reconcile the perception of depth with the fixed image, resulting in the impression that the subject is looking at us.
To experience this effect, you can try looking at a printed photo from different angles or moving around it. You'll notice that the eyes of the subject seem to meet your gaze, regardless of your position.