This apparatus consists of a Goniometer with 1 arc min resolution for measuring diffraction angle directly and a precision adjustable slit through which laser beam passes before falling on diffracting element. The equipment is specifically suited for studying elements with considerably greater diffraction angles like holographic gratings.

As the readings are taken through an eyepiece with crosswire, comparatively precision results are achieved. The apparatus can be used for studying both reflecting and transmitting type diffracting elements.

Unlike conventional spectrometer- goniometers, all modules in this device are open, simple and easy to assimilate.This feature gives students better understanding and hands onexperience. The apparatus can also be used for many other applications like measurements of prism angles, refraction angle, etc. where spectrometer-goniometers are generally used.

All components are made from corrosion free laboratory grade materials. Optics are of research quality made of N-BK 7 optical glass.