PURPOSE: Increase the dispersion in a white light spectrum by adding a second prism.

DESCRIPTION: Use the prismatic spectrum setup of demonstration N1-01: PRISMATIC SPECTRUM OF WHITE LIGHT - POINT SOURCE to obtain a standard white light spectrum, shown in the photograph in the center above. A second identical prism is inserted into the beam in the same sense as the first prism, so that the dispersion is increased, as seen in the photograph at the right with the same scale for comparison.

SUGGESTIONS:

REFERENCES: (PIRA unknown.)

EQUIPMENT: Bright point source with condenser lens and iris, 20cm focal length cylindrical convex lens, slit, 20cm spherical convex lens, and flint glass prism, with second identical prism.

SETUP TIME: 5 min.