AIM

The light interference phenomenon is observed as Newton's Rings. The various optical accessoriesused in the observations are studied. A travelling microscope is used to determine the diameter of the rings. The ring number versus square of the ring diameter plot gives a straight line. From theslope of the straight line the radius of curvature of the plano-convex lens used for producingNewton's rings is determined.

PROCEDURE

• A glass plate and a lens is fitted to experimental rod A. 
• The Newton Ring lens adjustable by 3 screws.
• On applying load at point, the rod C bends slightly. 
• Experiment rod carries 2 metal plates at different point increasing the distance between the plat and the lens. 
• Newton's rings are observe before applying the load. 
• As the load applied gradually the rings run into the centre, disappearing one at a time. 
• Microscope is provided for viewing the ring with cast iron weights set of 500 gm With out weights

SPECIFICATION 

BODY                 Solid M.S painted base with two vertical 18 inch 

RODS                 having arrangement for hanging weights and a third 12 inch rod with scale fitted for moment of Microscope. And the Forth rod for holding                                 Glass plate 

Movement         movement at 45 deg. And newton ring.

Scale                 A Brass scale 10 cm long &vernier to read 1/10mm with V slide clamp guides for wire ceiling attachment& torsion weight By Newton Ring                                 (interference method)

MICROSCOPE A standard microscope unit with 30x magnification and rotatable cross line eye piece. Focusing of microscope is through Rack and Pinion.

·MAGNIFICATION 30x magnification and rotatable cross line eye piece