A prism is used for refracting light.
Prism a prism is a solid geometric shape.
Solid geometric shapes can refract light.
What can refract light?

[a] focusing a lens
[b] Electrical energy
[c] solid geometric shapes
[d] an electron lens
[e] Something formed from skeleton
[f] single-celled organisms
[g] living things
[h] an electron microscope