Refraction represents a change in the direction of propagation when beams of light encounter a medium with a different density.
Reflection is the return of light to the medium it came from when it encounters a mirror.
The answer is the letter a
Answer:
미안해요. 나는 우리가 단지 부동일 중 하나를 모르지만 그것을 해결하는 방법을 모른다!.
