Physics Lab Equipment

LEOK-30 Newton's Ring Experiment Apparatus - Complete Model

LEOK-30 Newton's Ring Experiment Apparatus - Complete Model

Note: the actual power supply for Sodium lamp may look different


  • Including Sodium lamp with power supply

  • Including reading microscope for accurate measurement

  • Compact structure

  • Detailed instruction manual


The phenomenon of Newton's rings, named after Isaac Newton, is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. When viewed with monochromatic light, it appears as a series of concentric, alternating light and dark rings centered at the point of contact between the two surfaces. Using this apparatus, students can observe the phenomenon of equal-thickness interference. By measuring interference fringe separation, the radius of curvature of the spherical surface can be calculated.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click to view some sample pages of the instruction manual.


Minimum Division of Reading Drum0.01 mm
Magnification20x, (1x, f = 38 mm for Objective; 20x, f = 16.6 mm for Eyepiece)
Working Distance76 mm
View Field10 mm
Measurement Range of Reticle8 mm
Measurement Accuracy0.01 mm
Sodium Lamp15 ± 5 V AC, 20 W
Radius of Curvature of Newton's Ring868.5 mm
Beam Splitter5:5

Part List

Sodium lamp with housing and power supply1 set
Reading microscope1
Newton's ring assembly (SZ-37B)1
Beam splitter1
Focusing knob1

LEOK-30 Newton's Ring-1.jpg

Schematic of a lens and a flat plate used to form Newton’s rings

Copyright © Lambda Scientific Systems, Inc. 2010-2023. All rights reserved.