A Nodal Slide Assembly is a combination of optical instruments which are used together to determine the focal length of a combination of two convergent lenses using Nodal Slide Assembly. Since this forms the very basis of optics, it is included in most curriculums. Our Nodal Slide assembly is designed to deliver a smooth motion on each of the carriages which ensures accurate results. This setup helps students to understand the basic property of lens like focal length, focus point, nodal point, principal axis, centre of curvature etc. Nodal slide assembly includes  double bar optical bench 100cm long steel N.P. rods are mounted on a two rugged metal supports provided with levelling screws. One of the rods is graduated in mm & cm. Four sliders move freely on bed. Two sliders are provided with lateral cross motion and two without cross motion. Nodal slide upright provided with two vertical axes contain a carriage with suitable arrangement for combination of single and double lens holders. The lens holders are adjustable in height and are provided with lateral motion by rack and pinion. These motions can be noted along a scale. The vertical carriage containing the whole mount can rotate along the vertical axis along a circular graduated scale. Includes metal lamphouse provided with cord and plug. optical screen with a fine cross slit, plane mirror with proper inclining adjustments on metal stem.