Traditional Culture Encyclopedia - Photography major - Why are the shadows parallel when passing a streetlight along a straight road?
Why are the shadows parallel when passing a streetlight along a straight road?
When light hits an object, the object blocks the propagation of light and forms a shadow. When light shines on the street lamp, the street lamp will produce a light source. The light is emitted from the light source, passes through the lampshade of the street lamp, and then shines on the ground. In this process, light diverges from a point in all directions, forming a cone-shaped beam.
When light hits the ground, objects on the ground will block the propagation of light and form a shadow. On the highway, when the light from street lights shines on the ground, objects on the ground (such as trees, buildings, etc.) will block the spread of light and form a shadow. The shape of this shadow is related to the shape of the object, but the boundary lines of the shadow are parallel.
This is because light travels in a straight line, while the light of a street light radiates in all directions from one point. When light hits the ground, the light is perpendicular to the ground, forming a plane perpendicular to the ground. When an object blocks the propagation of light, the boundary line of the shadow is perpendicular to the propagation direction of the light, so the boundary line of the shadow is also parallel to the ground.
In addition, the street lights on the highway are generally distributed at equal distances, that is, the distance between each street light is equal. In this way, when the light hits the ground, the light of each street lamp will form a shadow, and the distance between the boundary lines of these shadows is also equal. Therefore, the shaded boundary lines are parallel across the entire highway.
To sum up, when passing a street light along a straight highway, there are two reasons why the shadows are parallel: First, the light propagates in a straight line, and the boundary line of the shadow is perpendicular to the propagation direction of the light, so the boundary line of the shadow is perpendicular to the propagation direction of the light. Parallel to the ground; second, the street lights on the highway are equally spaced, and the distance between the shadow boundary lines formed by the light of each street light is equal, so the shadow boundary lines on the entire road are also parallel.
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