Abstract

A simple, compact and inexpensive optical system is described which allows the dihedral angle of a roof-top mirror to be measured accurately. The system fits on a desktop and can be used to set and monitor the dihedral angle of the mirror. The ability to make adjustments while monitoring the angle is particularly useful when epoxy is used to secure the two plane mirrors that form the roof-top, since epoxy will tend to shrink as it cures.

© 2000 Optical Society of America

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