Experimental Set-Up has been designed specifically for the study of the Newton’s Rings. The set-up consists of Newton’s Rings Apparatus complete include reflector, Sodium light source, lens etc.

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.

Scope of Learning:

n Determination of the Wavelength of sodium light by measuring the diameters of Newton's rings

n Determination of the Refractive Index of a liquid transparent medium such as water using Newton's ring apparatus

Features :

n A microscope with x-y-z axes movement.
n Horizontal measurement scale with fine and coarse

movement Screw

n Cross wire in the field of view for ring's diameter measurement

n Newton's ring assembly consisting of plano-convex lens mounted on an optically plane glass plate

n Adjustable plane glass plate is provided to be inclined at 45o with respect to the vertical plane

.

Setup Consists Of :

n Newton’s Ring Microscope
n Lamp House
n Sodium Lamp
n Sodium Lamp Transformer

Technical Specifications :

Lens 

Type                 : Plano - convex 
Focal Length     : 100cm/200cm 

Diameter          : 6cm

Newton's Ring Microscope

Magnification : 10x
Horizontal Movement Limit : 9cm
Least Count of Circular Scale : 0.001cm
Weight (kg) : 5.7 (approximate)  

Sodium Vapour Lamp

Wavelength : 5893Å
Operating Wattage : 35W

Mains Supply : 230V ±10%, 50Hz