Prismatic Spectrum Of White Light - Point Source

Purpose

Demonstrate continuous spectrum.

Equipment

Bright point source with condenser lens and iris, 10cm focal length cylindrical convex lens, slit, 20cm spherical convex lens, and flint glass prism.

Setup Time

5 min.

Images

n1-01

Description

The bright point source is used to provide a continuous white light spectrum. Light from the point source is focused by a condenser lens with iris and a 10 cm focal length cylindrical lens onto a slit. A 20 cm focal length convex lens then images the slit onto the screen through an equilateral prism.

References

Jukka O. Mattila, Spectral Experiments with White Light, TPT 32, 338-339 (1994).