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Prism with Narrow angle 5 ° x 87.5 ° x 87.5 ° manufactured from Optical Borosilicate Crown glass having R.I. 1.510 App. Prism with Narrow angle 25 ° x 77.5 ° x 77.5 ° manufactured from Optical Borosilicate Crown glass having R.I. 1.510 App. Size 32 x 32 mm