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The physics of this prism does not change when you extend side BC until it coincides with side AD. The corner side CD is just for convenience. Therefore, point O is not necessary at one-third of BC. Or is this just the way all suppliers make it? Paul ( talk) 17:15, 20 November 2008 (UTC)
Is flint glass used ? What refractive index ? Presumably the 90 degrees only applies to the frequencies that experience the refractive index (given that the glass is dispersive) that the angles were designed for ? - Rod57 ( talk) 23:04, 8 April 2015 (UTC)
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The physics of this prism does not change when you extend side BC until it coincides with side AD. The corner side CD is just for convenience. Therefore, point O is not necessary at one-third of BC. Or is this just the way all suppliers make it? Paul ( talk) 17:15, 20 November 2008 (UTC)
Is flint glass used ? What refractive index ? Presumably the 90 degrees only applies to the frequencies that experience the refractive index (given that the glass is dispersive) that the angles were designed for ? - Rod57 ( talk) 23:04, 8 April 2015 (UTC)