Looking at oneself in a mirror Looking at a shadow of an object Viewing an object through an open window Viewing an object partially in water
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is the best observation of the refraction of light?
Possibilities:
- Looking at oneself in a mirror
- Looking at a shadow of an object
- Viewing an object through an open window
- Viewing an object partially in water

Viewing an object partially in water