EO-81 Advanced Spectroscope

Illustrates the dispersion of light Nature of continuous and spectral line sources Basic characteristics of prisms and gratings. Use of the vernier for angle measurement

An efficient tool for the study of refraction and dispersion of light by prisms and gratings. The instrument consists of a sturdy cast iron base with collimator tube support and a swinging telescope arm. The graduated circle is 15 cm in diameter; large enough to make the scale open and easy to read. The graduated scale is read by two verniers 180° apart.

The telescope and collimator lenses are achromatic with rack and pinion focusing, an aperture of 3.5 cm, and a focal length of 17.8 cm. The eyepiece is a 10X Ramsden type with a cross line.

The instrument is supplied with an EO-59 Crown Glass Prism n_d = 1.54

Two other prisms are available as accessories: EO-60 Dense Flint Glass Prism n_d = 1.62, EO-61 Extra Dense Flint n_d = 1.69

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