Interferometry
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.
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
Model No: ED-INT-01-TMRB
Magnification : 30 x
Micrometer Travel : 25 mm
Least Count : 0.01 mm
Quantity : 1 no.
Model No: ED-INT-01-LHRB
Height : 180 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.
Model No: ED-INT-01-LEDM
Height : 225 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.
Model No: ED-INT-01-PCL1000
Material : Borofloat
Diameter : 50 mm
Focal Length : 1000 mm
Quantity : 1 no.
Model No: ED-INT-01-PCL750
Material : Borofloat
Diameter : 50 mm
Focal Length : 750 mm
Quantity : 1 no.
Model No: ED-INT-01-OF
Material : Borofloat
Diameter : 50 mm
Quantity : 1 no.
Model No: ED-INT-01-BSP
Material : Borofloat
Diameter : 45 x 45 mm
Quantity : 1 no.
Model No: ED-INT-01-SLPS
Output Power : 35 W
Quantity : 1 no.
Model No: ED-INT-01-LEDP
Colours : Red, Blue, Green, Yellow
Output : 5V, 800 mA
Quantity : 1 no. each
Dust Protective cover
Instruction Manual
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
Navigation
Get in Touch
B.7., H.M.T. Industrial Estate
H.M.T. P.O, Kalamassery, Kochi
Kerala, India - 683 503
+91 920-719-7772 / 6 / 1
sales@holmarc.com
Mon - Sat : 9 am to 5 pm