Physics Lab Equipment

LEOK-31 Newton's Ring Experiment Apparatus - Enhanced Model

LEOK-31 Newton's Ring Experiment Apparatus - Enhanced Model


  • Microscopic CMOS color camera with displacement cursor

  • Newton's ring pattern displayed on VGA color monitor

  • Direct measurement using keypad controlled cursor on LCD color monitor

  • Camera and Sodium lamp available for other applications


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.


This apparatus uses an area VGA output color camera with a microscopic lens to acquire the Newton's ring pattern. The acquired pattern can be measured directly using a set of keypad controlled cursors on a LCD monitor. 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.


Light Sourcelow pressure sodium lamp, 20 W
Newton's Ring Deviceradius of curvature: ~868.5 mm; diameter: 32 mm; transmissive
Electronic Scaleresolution: 0.01 mm; viewing field: ~ 10 mm

CMOS Color Camera
sensor size: 1/4"
resolution: 1280 × 1024
pixel size: 2.8 μm x 2.8 μm
bit: 8
output format: VGA
frame rate: 15 Hz
optical mount: C/CS
function setting: via keypad and menu
menu functions: brightness, contrast, saturation, sharpness, tone, cursor, length
Camera Lensfocal length: 25 mm

Part List

Sodium lamp with housing and power supply1 set
CMOS color camera with AC adapter1 set
Camera lens with extension ring1
Newton's ring assembly1
Beam splitter with mount and post1 set
Camera stand with focusing knob1 set
VGA flat panel monitor (optional)1

LEOK-31 Newton's Ring-1.jpg

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

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