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 gave my students this multiple choice question: Which of the following is the best observation of the refraction of light?

Only one answer is correct among these 4 choices:
- 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

Could you tell me which one is correct?

Viewing an object partially in water