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CAT NO: DIDACTICELECTROMETER0032
Newton S Rings.
NEWTON S RINGS TRAINING PROGRAM
Determining the wavelength of sodium light
Determining the index of refraction of a liquid by using Newton’s ring apparatus
Determining the radius of curvature of plano-convex lenses with the test of Newton’s rings
Determining the thickness of a thin paper sheet
IMPORTANT CHARACTERISTICS
all the components, including sodium-vapour lamp, microscope, power supply unit and optical plates, are assembled in a unique unit
Optical plates of glass mounted at 45°
Simple collimation
Quick adjustment, good quality, well defi ned separate fringes
Matt black-painted housing for set of Newton’s rings
COMPONENTS
Newton’s ring apparatus
Spherometer
Plano-convex lenses with fl at pane of glass Newton’s ring apparatus This apparatus is used to determine the wavelength of sodium light.
A fi gure consisting of a series of alternating dark and clear concentric rings is displayed : these rings are thinner and thinner as they go from centre to periphery. All the components, including sodium-vapour lamp, microscope, power supply unit and optical plates, are assembled in a compact unit.
The system is equipped with plano-convex lenses of wide focal length, and with circular fl at pane of glass.
Dimensions: 390 x 480 x 170 mm
Micrometer: 0.01 mm
Eyepiece: 10x - Lens: 3x
Weight: approximately 12.6 kg
Spherometer This spherometer enables to measure the radius of curvature of plano-convex lenses.
It has two disks and 3 feet. Ruler and two disks are of brass.
Diameter of head disk of micrometer: 40 mm.
The lower disk that is wider has a diameter of 60 mm.
This instrument is equipped with a pane of glass. Range of 10-0-10 mm.
IMPORTANT CHARACTERISTICS
Microscope can work in both horizontal and vertical directions
Newton’s ring apparatus with pane of glass at 45°
COMPONENTS
Newton’s ring unit with reflector
Sodium light source
Bridge microscope
Wood block
Spherometer
Plano-convex lenses with fl at pane of glass
Newton’s ring apparatus with reflector Il consists of a matt black framework with a pane of glass mounted at 45° to refl ect the light downwards on a planoconvex lens of wide focal length laying on a fl at pane of glass.
The equipment includes plano-convex lenses.
Sodiun light source Sodium light source with circular opening having a diameter of 25 mm, and with a transformer. Bulb socket of brass for lamp of 2 A 220 Vac.
This source is fi xed on a rod installed on a base.
Input voltage: 470 V
Operating voltage: 220 V, 50 Hz
Light source: 300 x 85 mm (diameter) Bridge microscope This type of microscope is used in the tests on Newton’s rings and it can work in both horizontal and vertical directions.
The microscope with pinion alignment is positioned vertically and it can be fi xed in vertical or horizontal position.
Eyepiece: 10x - Lens: 3x
Scale length: 110 mm
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