This article from Khan Academy provides information about refraction and light bending. This information is intended for the Class 12 Physics Course (India).

Students can study this article to help them understand the concept of refraction and index of refraction.

Biography of Willebrord Snell (1580-1626), a Dutch mathematician known best for his work in refractive indices.

Get a visual of convention currents with this activity. This activity allows students to observe the currents by bending light due to cold and warm water.