Focal Length Using Nodal Slide Assembly

The nodal slide assembly consists of an optical bench provided with four uprights. The one upright carries a bulb placed in a metallic cover having a circular aperture, which illuminates a cross slit in the adjacent upright. The third upright carries the nodal slide. Nodal slide is essentially a horizontal metal support capable of rotating about a vertical axis; and lens or lenses can be mounted upon the support. The metallic support can be fixed or it can be moved back and forth by means of a screw so that the relative position of the two lenses can vary with respect to this upright. The support can be rotated in a horizontal plane. The fourth upright carries a plane mirror which can be rotated about a horizontal axis perpendicular to the bed of the bench.

Features:

• All electrical connections are made using 4mm safety sockets and plugs.
• Saddle can hold rod from 8 to 15mm.
• Heavy, rigid and stable Triangular Optical bench (made of Al extrusion).
• Height and level adjustment screws (made of SS).
• 2-12V, 5A, AC/DC power supply with Thermal Safety Switch.

Objectives:

• To determine equivalent focal length of a combination of lenses using nodal slide assembly.

Technical Data:

• Optical bench : Al exclusion, L=1m, Triangular shape with end stop, 4 point levelling (steel screw)
• Transversal slider : 25 – 0 – 25mm, LC 0.01mm,
• Lamp Housing : Aluminum, Bulb 12V 21W, Lens Spherical condenser, Connection 4mm plug lead, Mounting rod 10mm dia.
• Noddle Slide : Angular scale 1800 @ 10, Linear scale 140mm @ 1mm, Lens Holder Single & double arrangement
• Reflecting Mirror : Size 50x50x6mm, Surface λ/5, Front coated Mounting Rod10mm diameter
• Slit With Holder : Metal sheet, Type Cross, Mounting Rod 10mm diameter
• Power Supply : Output 2,3,4,5,6,8,10 & 12V AC/DC full wave rectified, Overload Resettable thermal trip, Input 230 V AC,50 Hz

Scope of Delivery:

• 1 Lamp housing
• 1 Power supply 2-12V AC/DC
• 1 Optical bench triangular
• 3 Fixed slider
• 1 Transversal slider
• 1 Cross slit big
• 1 Reflecting mirror
• 1 Noddle slide assembly
• 2 Lens
• 1 Metal screen

Key Topics:

• Lens
• Nodal point
• Principal axis
• Centre of curvature
• Focal point
• Principal point
• Equivalent focal length
• Optical center