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Home > All Images > 1991 > April > 19 Apr 1991

Images Dated 19th April 1991

Choose from 9 pictures in our Images Dated 19th April 1991 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Light passing through prism Featured 19 Apr 1991 Print

Light passing through prism

A prism demonstrating refraction and reflection effects. A beam of white light strikes the prism, refracting onto the right hand face. At this face, some of the light is refracted again, exiting the prism and forming the spectrum. The spectrum is a result of the different amounts of refraction of the different wavelengths of light present. Some of the light is reflected by the face, exiting the prism from the closest face. As it leaves the prism, it is refracted in an opposite direction to when it entered, balancing out the effect and maintaining its white appearance

© DAVID PARKER/SCIENCE PHOTO LIBRARY