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To determine the dispersive power of the material of a given prism by the spectrometer
Apparatus Required
Spectrometer, Prism and Mercury Vapour Lamp
The Dispersive power of the material of the given prism is expressed as
ω = (μ 2 - μ 1 )/(μ-1)
Where μ 1 and μ 2 are the refractive indices of two colors
μ = (μ 1 + μ 2 )/2
Usually the colors chosen are blue and red so that
ω = (μ b - μ r )/(μ - 1)
Where μ = (μ b + μ r )/2
- The usual adjustments of the spectrometer are made .The refractive angle of the Prism is found.
- Then the prism is mounted on the prism table and the position of prism is adjusted to observe the spectrum of the mercury vapor.
- Observing the blue line in the spectrum through the telescope, the prism is adjusted for minimum deviation position.
4. Working with the tangent screw of the telescope, the position of the prism is adjusted so that the blue line is just one point of refracting its path after coming to the point of intersection of the cross wires.
5. The readings of the telescope for the minimum deviation of red line are noted.
6. The telescope is brought in line with the collimator and removing the prism, the direct readings on both verniers are noted.
7. The respective differences give the minimum deviations for blue and red colors.
Their refractive indices are found by
μ b = [Sin (A+D b ) / 2] / [Sin (A/2)] & μ r = [Sin (A + D r ) / 2] / Sin (A / 2)
The Dispersive power of the material of the prism, for blue and red colors is found by the relation
Observations
The observations of the above experiment are as follows
V 1 = MSR o + (LC') VC
Dispersive power ω = (μ b - μ r )/(μ - 1)
Precautions
- The prism should be adjusted for each colour separately.
- Readings are noted without any parallax error.
The Dispersive power of the material of the prism = ...............
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Engineering Physics Lab Experiment list
- 1 Law of Malus in Polarization with Graph
- 2 Determination of Planck's constant using Photo Vacuum Tube
- 3 To determine the wavelength of light using a plane diffraction grating by measuring the Angle of minimum deviation.
- 4 To determine the dispersive power of the material of a given prism by the spectrometer
- 5 To determine the rigidity modulus of the material of the given wire by dynamical method using a Torsional pendulum.
- 6 To determine the numerical aperture of the given optical fiber
- 7 To study V-I characteristics of LED vs laser diode
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Jun 14, 2023 · To determine the dispersive power of the material of a given prism by the spectrometer. Apparatus Required. Spectrometer, Prism and Mercury Vapour Lamp. Principle. The Dispersive power of the material of the given prism is expressed as. ω = (μ 2 - μ 1)/(μ-1) Where μ 1 and μ 2 are the refractive indices of two colors. μ = (μ 1 + μ 2)/2
The resolving power of the glass prisms is determined from the dispersion curve. Fig. 1: Experimental set-up for determining dispersion in liquids. Area of Expertise: Physics Education Level: University Topic: Light and Optics Subtopic: Diffraction and Interference Experiment: Dispersion and resolving power of the prism and grating spectroscope
The details of the prism dispersion depend on the geometry used and the index dispersion curve. However, assuming the prism is used at or near MIN, the average prism dispersion over a wavelength band (F to C) can be estimated. MIN n C F d Dispersion of a prism d d d d dn dnd MIN ddnd dnd 2sin sin /21 MIN n 2sin /2 0 cos /2 MIN MIN d dn a Glass ...
dispersive power of the material of the prism. (ii) To plot µ-1/λ2 curve and hence determine Cauchy’s constants for the prism material. Apparatus: Spectrometer, prism, Hg lamp and spirit level Theoretical background When a ray of light is refracted by a prism, the angle between the incident and refracted ray is called the angle of deviation δ.
table in the same direction. Lock both the telescope and the prism table and to use the fine adjustment screw for finer settings. Note the angular position of the prism. In this position the prism is set for minimum deviation. Without disturbing the prism table, remove the prism and turn the telescope (now unlock it) towards the direct rays from
Consider a prism of angle A and refractive index n 2. Let i1 and r1 are the incident and refracted ray from face AB, and i2 and r2 are the incident and emerged ray from the second face AC. Dispersive power of prism . The refractive index of the material of the prism can be calculated by the equation. -----(3)
3. To determine the refractive index of various glass prism. 4. To determine the wavelengths of the mercury spectral lines. 5. To demonstrate the relationship between refractive index and wavelength (dispersion curve). 6. To calculate the resolving power of the glass prisms from the slope of the dispersion curves. Set-up and procedure
red light. So a prism can be used to disperse white light into its component colors. white red blue n wavelength λ blue red In this experiment, we will use a prism spectrometer to measure the dispersion angle of various wavelengths. From the measurements, we will make a graph of the index of refraction vs. wavelength.
PHYWE Systeme GmbH & Co. KG · D-37070 Göttingen Laboratory Experiments Physics89 Dispersion and resolving power of the prism and grating spectroscope 2.1.03-00 Geometrical Optics Optics Principle: The refractive indices of liquids, crown glass and flint glass are deter-mined as a function of the wave-length by refraction of light through
This document describes an experiment to determine the dispersive power of a glass prism using a spectrometer. Key steps include: 1) Adjusting the spectrometer for perpendicular optical axes and a level prism table. 2) Measuring the angle of the prism and the angle of minimum deviation for red, yellow, and green spectral lines. 3) Calculating the refractive index for each color and the ...