Description This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen. Use the sliders to change the distance from the grating to the screen, the number of lines per millimeter in the diffraction grating, and the wavelength of the laser. Use the diagram of the screen in the top window to analyze the numerical positions of the dots on the screen using diffraction equations.
Diffraction grating: to determine the wavelength of laser
Switch on the electric power supply which is given to He-Ne Laser Apparatus.
Observe the diffraction pattern on the Screen.
Measure the distance between grating & the Screen (D).
For the 1st order spectrum, measure the distance y1 & y2.
Similarly, for 2nd order spectrum also measure y1 & y2.
From the available data, compute wavelength (λ) for the given He-Ne Laser light.
Observation Table
- Wavelength (λ) of a given light is _____Å
- Standard value of Wavelength (λ) of a given light is _____Å
- Percent Error in obtained result _____%
A Diffraction Grating
- Andrew G Duffy
Big Ideas Of Science
- Energy Transformation
- Fundamental Forces
- Structure Of Matter
Subject Domains
- Wave Characteristics - Generally
- Diffraction
Booking Required
Registration required.
- Diffraction grating
Preview Link
Works offline, description.
In this lab, you can explore what light does when it encounters a diffraction grating. Use at least one of the checkboxes to turn on a beam of light. When the light encounters the diffraction grating (a comb-like structure with a large number of equally spaced openings), the light is diffracted, because of constructive interference, at particular angles. Compared to a double-slit, the lines produced by the diffraction grating are very sharp (narrow) and bright.
A close-up of the center of the grating can be seen at the bottom right. You can use the slider to control the grating spacing, which is the distance between neighboring openings in the grating.
In the simulation, red light has a wavelength of 650 nm, green light has a wavelength of 550 nm, and blue light has a wavelength of 450 nm.
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Virtual Laboratory of Physics of Federal University of Ceara
Interactive simulations for teaching physics, diffraction grating, authors: ms. giselle dos santos castro - federal university of ceara - ufc dr. nildo loiola dias - federal university of ceara - ufc, controls: , - choose the light color (wavelength) from 3 possibilities. - choose a diffraction grating from three possibilities. - adjust the distance between the diffraction grating and the screen on the available cursor. - click the show ruler button to get a ruler that can be moved to the desired position., description of the simulation:, this simulation makes it possible to study the diffraction of light in diffraction gratings. there are three wavelengths (colors) to choose from, a diffraction grating with 80 lines/mm allows you to determine the wavelengths. there are two diffraction gratings whose number of lines/mm is unknown. a cursor allows you to vary the distance between the diffraction grating and the screen. the diffraction pattern generated on the screen can be visualized. a ruler allows you to measure the necessary distances., for an analysis of the data, consult one of the proposed activity guide . .
IMAGES
COMMENTS
Learn how to use a spectrometer, a diffraction grating and a mercury arc lamp to determine the wavelength of different spectral lines of mercury light. Explore the theory, apparatus and procedure of this virtual lab.
This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen.
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Diffraction grating: to determine the wavelength of laser. Aim Theory Pretest Procedure Simulation ...
Observe the diffraction pattern on the Screen. Measure the distance between grating & the Screen (D). For the 1st order spectrum, measure the distance y1 & y2. Similarly, for 2nd order spectrum also measure y1 & y2. From the available data, compute wavelength (λ) for the given He-Ne Laser light. Observation Table
In this lab, you can explore what light does when it encounters a diffraction grating. Use at least one of the checkboxes to turn on a beam of light. When the light encounters the diffraction grating (a comb-like structure with a large number of equally spaced openings), the light is diffracted, because of constructive interference, at ...
This simulation makes it possible to study the diffraction of light in diffraction gratings. There are three wavelengths (colors) to choose from, a diffraction grating with 80 lines/mm allows you to determine the wavelengths. There are two diffraction gratings whose number of lines/mm is unknown.
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