Made from moulded glass, all faces highly polished. Suitable for beginner’s study of basic laws of refraction by the pin-sighting method.   Length    Breadth    Thickness    75 mm      50 mm         18 mm    100 mm     60 mm          18 mm    115 mm      65 mm          18 mm

Made from moulded glass, all faces highly polished. Suitable for beginner’s study of basic laws of refraction by the pin-sighting method.   Length    Breadth    Thickness    75 mm      50 mm         18 mm    100 mm     60 mm          18 mm    115 mm      65 mm          18 mm