Talk:Pellin–Broca prism

Geometry

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)

You're right, the original statement is valid only for a certain type of Pellin Broca prisms. I've updated the page with a more general definition of the best rotation axis and added the reference. Clarafly (talk) 08:02, 5 November 2013 (UTC)

Are the angles specified dependant on the refractive index of the glass

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)