NEWTON'S RINGS APPARATUS

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Description

Exp-1 To determine the wavelength of sodium light.
Exp-2 To determine the refractive index of a liquid by using Newton’s rings apparatus.
Exp-3 To find the radius of curvature of planoconvex lens using Newton’s rings experiment, given λ=5893A°.
Exp-4 To find the thickness of a thin sheet of paper (air wedge experiment)..

 
 

Principle and Working :
A plano-convex lens is placed with its convex surface on the optically plane glass plate so as to enclose a thin film of air of varying thickness between the lens and the plate. Light from an extended monochromatic source is converted into a parallel beam of light by using a convex lens of short focal length and made to fall on an optically plane glass plate inclined at an angle of 45° to the vertical, where it gets reflected on to the Plano-convex lens. The wavelength of monochromatic light source is determined from the radii of the interference rings.

Contents:

Cat No. Item Name Qty.
SW916 Newton’s ring apparatus 1
SP821 Spherometer 1
R7708 Plano convex lens with plane glass plate 1
Spherometer (Disc Brass) SP821
  • Spherometer
    SPECIFICATIONSType: 3 legs
    Verticale Scale: 6mmx6mm (WxT)
    Micrometer: Dia. 40mm, Brass
    Lower Disc: dia. 60mm
    Range: 10-0-10mm
    Least Count: 0.01mm

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