Total internal reflection: 45 deg-45 deg-90 deg prism using arc lamp.

6A44.68 • E+50+0

diagram for demo

Total internal reflection: 45 deg -45 deg -90 deg prism using arc lamp. This apparatus is designed to show ray optics such as reflection, refraction and total internal reflection in prisms. White light from a carbon arc shines through a slit, producing a ray that is beamed into a prism mounted on a large white rotateable disk marked with degrees. The ray also glances against the disk, making it visible to the class. There are several Lucite (and glass) prisms that can be used: 45 deg -45 deg -90, 60 deg -60 deg -60 deg , and 45 deg -62.5 deg -62.5 deg . Note: Blackboard optics, X, shows basically the same things and is more easily viewed by a large class.

Related Demos

6A44.20 Total internal reflection/critical angle: Nakamura water tank. 6A44.40 Light pipes and fiber optic flashlight. 6A44.45 Water fiber optic 6A44.40 Flexible light pipe using arc lamp.
E+50+5 Four-prisms, same index of refraction, different angles, using laser. E+50+10 Eight-prisms, different index of refraction, same angle, using laser. E+50+15 Blackboard optics: Light source and lucite prism. E+50+20 Refraction of white light by prism using arc lamp. E+50+25 Light from arc lamp enters direct view prism emerges as spectrum. E+50+30 Dove prism to erect projected images using arc lamp. E+50+35 Binoculars and Porro prisms to show. E+50+40 Applet: The Prism