# simulating arrow illusion

now i need to simulate the arrow illusion which is,an arrow drawn on a sheet of paper that is put 4 inches behind a glass and then the glass will be filled with water and look at the arrow through the glass we should find that the arrow direction is reversed due to refraction of light(you can check that on youtube). I know how to simulate fluids, but how do i simulate that refraction? How can i simulate what happens to the arrow?

• I have removed your additional question. Please only include one question per post. Open a new post for every question! This question may help you. – Leander Apr 12 '19 at 18:23