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Prism with different angle 25 ° x 25 ° x 130 ° manufactured from Optical Borosilicate Crown glass having R.I. 1.510 App. Prism with different angle 20 ° x 20 ° x 140 ° manufactured from Optical Borosilicate Crown glass having R.I. 1.510 App. Size 32 x 32 mm