To study the diffraction pattern of a crossed grating using a LASER source and hence to determine the grating constant.
A crossed grating is a combination of two transmission gratings such that the rulings of one are perpendicular to the rulings of the other. When a LASER beam of wavelength is incident normally on a crossed grating, a pattern of two dimensional diffraction spots will be formed on a screen placed parallel to the plane of the grating at a measured distance from it.
The equipment consists of :
- LASER source.
- LASER stand with grating holder.
- Crossed Grating.
- LASER Detector head with digital Display.
- Manual.
Additional Accessory required :
- Travelling Microscope