When an object with the same height is vertical to the ground, the shadow of the object near the point light source is short and the shadow of the object far from the point light source is long under the light. Solution: The shadow length will get shorter as it gets closer to the light, and it will be a point when it gets to the light, and then it will get bigger as it gets farther away from the light, but it does not conform to the parabolic analytical formula, so choose A. 。