Newton’s rings with interference filters
In a Newton’s rings apparatus, monochromatic light interferes in the thin film of air between the slightly convex lens and a plane glass plate. The wavelengths are determined from the radii of the interference rings.
- the color of soap bubbles is based on it: interference in thin films
- use interference optics to determine most subtle differences
- elaborate filters make quantitative measurements possible
Lens holder
Lens, mounted, f +50 mm
Screen, translucent, 250×250 mm
Double condenser, f = 6 cm
High pressure Hg Lamp, 50 W
Optical bench expert, l = 1000 mm
Base for optical bench expert, adjustable
Slide mount for optical bench expert, h = 30 mm
Slide mount for optical bench expert, h = 80 mm
Interference filters, set of 3
Newton rings apparatus
Ruler, plastic, 200 mm
Power supply 230 V/ 50 Hz for 50 W-Hg-lamp
Using the Newton’s rings apparatus, to measure the diameter of the rings at different wavelengths and:
- to determine the wavelengths for a given radius of curvature of the lens
- to determine the radius of curvature at given wavelengths.
- Coherent light
- Phase relationship
- Path difference
- Interference in thin films
- Newton’s ring apparatus