The lake reflects people coming and going-the reflection of light. The lake is equivalent to a flat mirror. When light strikes a flat mirror, it can be imaged. The water reflects people coming and going, which is a virtual image of people on the shore. So the people we see coming and going are actually virtual images of people on the shore, so they are knowledge of light reflection or plane mirror imaging.
The lens remembers the vicissitudes of the world-the lens is a convex lens, and the lens remembers that the convex lens forms a virtual image through the refraction of light, so it applies the knowledge of convex lens imaging and light refraction.
The vastness and remoteness of the universe-the apparent distance of human eyes. The apparent distance of normal eyes is about 1500m, that is to say, beyond the distance of 1500m, normal eyes can't tell who is in front of and who is behind two objects according to their body angles, so people will feel that the stars in the sky are all on the same plane.
The story of digging a wall to steal light refers to: because light travels along a straight line and is blocked by a wall, digging a wall to steal light allows light to emerge from a solid hole; The basis is the straight-line propagation of light.
Therefore, the answer is: people come and go in the lake; Reflection of light. Think back to the ancients, who cut the wall in Kuang Heng. The camera remembers the vicissitudes of the world; The refraction of light. Write any set of answers. )