Transparent materials such as water and glass can slightly slow down a light beam causing the phenomenon of refraction - the basis for lenses and prisms.
(Transparent materials such as water and glass; can slow down; a light beam causing the phenomenon of refraction - the basis for lenses and prisms) (a light beam; causing; the phenomenon of refraction)
Transparent materials such as water and glass a light beam
can slow down causing
a light beam causing the phenomenon of refraction - the basis for lenses and prisms
the phenomenon of refraction