Schematic of a lens and a flat plate used to form Newton’s rings
Note: the actual power supply for Sodium lamp may look different
Features
Including Sodium lamp with power supply
Including reading microscope for accurate measurement
Compact structure
Detailed instruction manual
Introduction
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.
Specifications
| Description | Specifications |
| Minimum Division of Reading Drum | 0.01 mm |
| Magnification | 20x, (1x, f = 38 mm for Objective; 20x, f = 16.6 mm for Eyepiece) |
| Working Distance | 76 mm |
| View Field | 10 mm |
| Measurement Range of Reticle | 8 mm |
| Measurement Accuracy | 0.01 mm |
| Sodium Lamp | 15 ± 5 V AC, 20 W |
| Radius of Curvature of Newton's Ring | 868.5 mm |
| Beam Splitter | 5:5 |
Part List
| Description | Qty |
| Sodium lamp with housing and power supply | 1 set |
| Reading microscope | 1 |
| Newton's ring assembly (SZ-37B) | 1 |
| Beam splitter | 1 |
| Focusing knob | 1 |
Schematic of a lens and a flat plate used to form Newton’s rings
