Direct Vision Spectroscope

A direct vision spectroscope consist of three crown and two flint glass prisms of suitable refracting angles. The prisms are fixed in a metal tube. A collimating lens is fixed at one end of the tube and a telescope at the other. The angles of the prisms are such that the total deviation produced for the mean rays is zero. The refracting angles of crown and flint glass prisms are in opposite directions. Thus, the deviation produced by the crown glass prisms in one direction is equal and opposite to that produced by the flint glass prisms in the opposite direction. There will be resultant dispersion and the dispersed beam is almost parallel to the incident beam. The prisms are cemented together with Canada balsam ( = 1.54) to minimize the reflection losses at the interfaces. A spectroscope of this type is very handy and is used to study qualitatively the spectra of different sources of light. Use of more than two prisms increases the resolving power of the instrument i.e. the spectral lines will appear well separated from one another.

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