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achromatic prism
ach·ro·mat·ic prism (plural ach·ro·mat·ic prisms)


noun 
Definition:
 
prism not dispersing light: a composite prism in which two or more prisms deflect, but do not disperse, light
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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