For measuring critical angle and observing total internal reflection.
Made of clear optical glass.
Angles 90°-45°-45°.
Approximate dimensions are:

Relatively inexpensive prisms for the students These are molded from soda-lime glass and may have waves and small bubbles.
The sizes are approximate only.

For studying the laws of optics.
Made of 15mm thick and 32mm wide with two parallel sides 90mm and 40mm long at angles of 45° and 60°. One large surface is frosted enabling to follow the path of light.

For index of refraction experiments.
Glass

To verify the laws of refraction.

Dimensions: (l x w x h), 114 x 63 x 18mm.
Polished on all sides.

To verify the laws of refraction.

Dimensions: (l x w x h), 114 x 63 x 18mm.
With frosted faces and clear edges. The glass is greenish in tint.

The same with higher quality colorless (bleached) glass.

To verify the laws of refraction.

Dimensions: (l x w x h), 70 x 70 x 6mm.
With opposite edges frosted and the other two polished.

To verify the laws of refraction.

Dimensions: (l x w x h), 70 x 70 x 10mm.
With opposite edges frosted and the other two polished.