If you sail on a boat on the calm clear water of the lake, it seems that the deepest place is under the boat. Why?

Light rays incident perpendicularly to the surface that separates one medium from another do not change their direction. Therefore, the further from the boat the rays of light are refracted, the shallower the depth of the lake seems, and vice versa, the closer to the boat the rays of light are refracted, the deeper this lake seems.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.