It can be explained according to the reflection law of light and the related knowledge of axial symmetry:

First, the reflection law of light

? (1) (three-line * * * plane) The reflected light is in the plane determined by the incident light and the normal;

? (2) (the normal is centered) The reflected light and the incident light are located on both sides of the normal respectively;

? (3) The reflection angle is equal to the incident angle. .

Second, the axial symmetry:

When a graph is folded in half along a straight line and can overlap with another graph, we say that the two graphs are symmetrical about this straight line, which is also called axial symmetry.

As shown in the figure:

∠ EPD =∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠8736

∠EPD=∠E'PD，

So ∠E' PD =∞? Prostatic hyperplasia,

So E'PB is a straight line.

Small message:

~ About mirror symmetry? This is a line, Alexander, 1996 Young Geometrician in Berkeley? Givental proved a mathematical conjecture in mirror symmetry. This conjecture is the basis of string theory. 1In the autumn of 997, Liu Kefeng, a student of Qiu Chengtong and a professor at Stanford University, spoke at a mirror-like academic conference in Harvard. According to two geometricians present at that time, Liu gave a proof similar to Givental's proof at the meeting, and the Asian Mathematical Journal published an article on "Mirror Principle I". AJM is an international mathematical magazine co-edited by Qiu Chengtong. In this paper, Qiu Chengtong and other authors claim that this is the "first complete proof" of the mirror image hypothesis.