Brewster Angle Meter
Placing a gem inside a Brewster Angle Meter. This instrument was introduced in 1999. This instrument can be used to find the refractive index (RI) of gems, which can help with identification
Picture No
10711140
Media ID
47585346
Size
3426px x 3393px
(8.0MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
