It is divided in two parts :(i) Mechanical,a) Bed : It is optically ground and stable.Lead Screw : It is also optically ground and stable.Optical Mirror Mount : Kinematic mirror mounts are provided to hold the mirror.(ii) Optical Part Beam Splitter : It is optically work with 2/10 surface flatness.b) Compensating Plates : Two plates are provided. Mirrors : 2 Nos mirror of focal length 25mm are provided