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Interferometry


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Newton's Rings Apparatus
Model: HO-ED-INT-01
Price : $ 1,042.00

In this apparatus, light from a sodium lamp falls on the glass plate, inclined at 45 degree to the horizontal, get reflected, and then falls normally on the convex lens placed over the glass plate. A system of bright and dark concentric circular rings are observed through a microscope, arranged vertically above the glass plate. The microscope is properly focused so that alternate bright and dark concentric circular rings are observed more clearly. Measurements are taken from a micrometer driven traveling microscope, which is integrated with this apparatus.

The two interfering beams, derived from a monochromatic source satisfy the coherence condition for interference. Ring shaped fringes are produced by the air film existing between the convex surface of a long focus planoconvex lens and the plane of glass plate.

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Experiment

   To determine the wavelength of Sodium light and LEDs ( Red, Blue, Green, Yellow ).

Let Dm and Dm+k be the diameters of the mth and (m+k)th dark ring respectively. Then,

D2m  =  4 mRλ

D2m+k  =  4 (m+k) Rλ

D2m+k  -  D2m  =  4 kRλ

λ  =  [D2m+k  -  D2m] / 4kR

D2m  =  4 mRλ

where λ is the wavelength used and R is the radius of curvature of the lens.

   To find the refractive index of liquid.

Refractive index of liquid,

n  =  mλr / r^2

where, m order of the fringe, R Radius of curvature of the lens

λ wave length of light, r radius of the ring

   To find the diameter of thin wire or thickness of a thin strip of paper using air wedge method.

The diameter or thickness of the wire,

d  =  lλ / 2β

λ is the wavelength of the light

β is the bandwidth

l is the diameter of the wire or thickness of a thin strip of paper from the line of contact of the two plates of the air wedge.

Scope of Supply

Travelling Microscope with Rigid Base

Model No: ED-INT-01-TMRB
Magnification : 30 x
Micrometer Travel : 25 mm
Least Count : 0.01 mm
Quantity : 1 no.

Lens Holder with Rigid Base

Model No: ED-INT-01-LHRB
Height : 180 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.

LED Mount with Rigid Base

Model No: ED-INT-01-LEDM
Height : 225 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.

Plano Convex Lens

Model No: ED-INT-01-PCL1000
Material : Borofloat
Diameter : 50 mm
Focal Length : 1000 mm
Quantity : 1 no.

Plano Convex Lens

Model No: ED-INT-01-PCL750
Material : Borofloat
Diameter : 50 mm
Focal Length : 750 mm
Quantity : 1 no.

Optical Flat

Model No: ED-INT-01-OF
Material : Borofloat
Diameter : 50 mm
Quantity : 1 no.

Beamsplitter Plate

Model No: ED-INT-01-BSP
Material : Borofloat
Diameter : 45 x 45 mm
Quantity : 1 no.

Sodium vapor lamp with Power Supply

Model No: ED-INT-01-SLPS
Output Power : 35 W
Quantity : 1 no.

LED's with Power supply

Model No: ED-INT-01-LEDP
Colours : Red, Blue, Green, Yellow
Output : 5V, 800 mA
Quantity : 1 no. each

Accessories

Dust Protective cover
Instruction Manual

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Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.

ISO 9001:2015 Made in INDIA

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   +91 920-719-7772 / 6 / 1
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   Mon - Sat : 9 am to 5 pm

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