Spectroscopy
Spectrometer-Goniometer is a versatile instrument for studying the spectrum of different light sources as well as for characterization of components like prisms and gratings. Unlike common spectrometers, this model is designed in such a way that students get better understanding of the working principles of spectrometer. All modules are deliberately made open and easy to understand. Students gain hands on experience in the basics of spectroscopy.
This Goniometer is used for measuring optical data of prisms. It offers precise angle and refractive index measurements. The well designed mechanics of the Goniometer allows maintenance-free operation over many years. Conventionally, the measurement of refractive index is carried out with a dispersion prism made from the material to be tested. For the measurement of refractive index of fluids, a hollow prism, which is filled with the liquid, is used. It can also be used as a spectroscope for qualitative examination and measurement of emission and absorption spectra.
Experiment
To determine the focal length of convex lens.
The refractive index of the solid prism using the formula,
n = sin ( (α+β) / 2 ) / sin (α/2)
Where α is angle of the prism & β is angle of minimum deviation.
Dispersive power of the material of the prism.
Dispersive power,
ω = (n2 - n1) / (n - 1)
where,
n1 and n2 are the refractive indices of the prism for any two colours and n = ( n1 + n2 ) / 2
Refractive index of various liquids using liquid prism.
Replace the solid prism with hollow prism containing the liquid for which the refractive index to be calculated.
The experimental procedure is same as solid prism.
Refractive index of various liquids using liquid prism.
If a parallel beam of monochromatic light is incident normally on the face of a plane transmission diffraction grating, bright diffraction maxima are observed on the other side of the grating. These diffraction maxima satisfy the grating condition :
d sinθ = nλ
d is the distance between slits = 1/N is the grating constant, is the number of lines per unit length. n is the order of spectrum which can take values 0, ±1, ±2, ±3 …….
λ is the wavelength of the incident light.
This equation is referred to as grating equation.
Scope of Supply
Model No: HO-SP-RE-01-G
Resolution of prism table : 30 arc min
Resolution of Spectrometer : 1 arc min
Quantity : 1 no.
Model No: HO-SP-RE-01-OR
Length : 500 mm
Material : Black anodized Aluminum alloy
Quantity : 1 no.
Model No: HO-SP-RE-01-SM
Controlling : Micrometer
Slit Size : 0 - 3mm
Quantity : 1 no.
Model No: HO-SP-RE-01-CLM
Material : N-BK7
Focal length : 202 mm
Diameter : 50 mm
Quantity : 1 no.
Model No: HO-SP-RE-01-MLPS
Input : 230V, 50 Hz
Quantity : 1 no.
Model No: HO-SP-RE-01-T
Magnification : 10 X
Quantity : 1 no.
Model No: HO-SP-RE-01-HP
Material : PMMA
Quantity : 1 no.
Model No: HO-SP-RE-01-EP
Material : N-SF1
Quantity : 1 no.
Model No: HO-SP-RE-01-HG
Groove spacing : 500 lines / mm
Size : 50 x 50 mm
Quantity : 1 no.
User 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
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