Newton’s Rings Experiment

The light from monochromatic source is 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.

Features:

• Modular approach.
• Economy model.
• Moveable reflector arrangement.
• Fine X-axis movement of microscope.
• Microscope can be used vertically and horizontally.
• High quality glass plates (flatness λ/10).
• Sodium source can be used in vertical & horizontal positions.

Objectives:

• To determine the wavelength of sodium light.
• To determine the refractive index of a liquid by using Newton’s rings apparatus.
• To find the radius of curvature of planoconvex lens using spherometer.
• To find the thickness of a thin sheet of paper (air wedge experiment).

Technical Data:

• Type : Bridge type microscope
• Main scale : Range 0 -170mm, 1 MSD 0.5mm
• Vernier LC : 0.01mm
• Magnifier : FL 50mm, dia. 25mm
• Eyepiece : Ramsden 10X
• Objective : 3X
• Spherometer disk(brass) : 3 legs, Vertical scale 6 x 6mm(WxT Micrometer 40mm, Brass disc dia. 60mm, Range 10-0-10mm, Least count 0.01mm
• Plano convex : Dia. 61.5mm, Glass, FL 200mm
• Lens holder : 80 x 30mm
• Sodium source : MS housing, 200 x 85mm (LxØ), slit (LxW) 20x16mm
• Sodium bulb : 35W
• Reflector ass. : PVC, 105 x 100 x 110mm
• Fuse : 2A

Scope of Delivery:

• 1 Reflector assembly
• 1 Sodium light source
• 1 Bridge type microscope
• 1 Wooden block
• 1 Spherometer double disc with glass plate
• 1 Plano convex lens with plane glass plate
• 1 Lens arrangement
• 1 Plain glass plate pair (50 x 35 x 2mm)
• 1 Power cord
• 1 Plain glass (75 x 75 x 2mm)
• 1 Plain glass (122 x 89 x 1.8mm)