Optical prism and Optical device

Optical prism noun - Optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image.

Optical device and optical prism are semantically related. In some cases you can use "Optical device" instead a noun phrase "Optical prism".

Optical device noun - A device for producing or controlling light.

Optical prism and optical device are semantically related. Sometimes you can replace phrase "Optical prism" with "Optical device", this phrases are similar.