The refraction of light in glass prism is different from a glass slab. This is because in glass prism, the incident ray of light is not parallel to emergent ray of light.

Prism light overlay, crystal diamond shine of rainbow light with flares, vector effect background. Prism light glares or lens flare spectrum of gem glass refraction and sun light shiny dispersion ...

Newton begins his 1672 account by relating his surprise that the colored spectrum produced by his prism was rectangular in shape rather than circular, "as the received laws of Refraction" would ...

"Cloaking Device Breakthrough? Negative Refraction Of Visible Light Demonstrated." ScienceDaily. ScienceDaily, 23 March 2007. <www.sciencedaily.com / releases / 2007 / 03 / 070322132145.htm>.