This apparatus (Model No: HO-ED-D-02) is meant for graduate and post graduate level courses in physics. Here, the diffraction pattern is closely studied using a detector mounted on translation stage. The device consists of 1.2 meter long optical rail along with carriages, optics and opto-mechanics. At one end of the rail, X - translation stage with detector is mounted and at the other end, laser is held on a kinematic mount. Linear scale attached to the rail makes length measurement easy and convenient. Both the laser head and detector stages are mounted on rail carriages with locks, which in turn can be mounted anywhere on the rail conveniently.
In this apparatus, diffraction experiments are carried out with a photo sensitive detector and laser is used as light source. The diffraction element is placed at a certain distance from the detector and the pattern is allowed to fall on the detector stage. The micrometer driven stage is used to move the detector to extreme end of the diffraction pattern and the intensity is noted at close intervals by traversing the detector through the cross section of the spectrum. The intensity versus distance curve is plotted on a graph for calculations.
The diffraction equation (condition for minima) is,
Sin θm= m λ / d
Wheredis the slit width,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder minimum.
From this we can find out the slit widthdas
d = m λ / Sin θm
The diffraction equation (condition for maxima) is,
Sin θm= m λ / d
Wheredis the slit width,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder maximum.
From this we can find out the slit widthdas
d = m λ / Sin θm
The diffraction equation (condition for maxima) is,
Sin θm= m λ / d
Wheredis the diameter of the wire,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder minimum.
From this we can find out the slit widthdas
d = m λ / Sin θm
The diffraction equation (condition for maxima) is,
Sin θm= m λ / d
Wheredis the diameter of the wire,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder maximum.
From this we can find out the slit widthdas
d = m λ / Sin θm
The diffraction equation (condition for maxima) is,
Sin θm= m λ / d
Wheredis the Groove spacing,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder maximum.
From this we can find out the slit widthdas
d = m λ / Sin θm
The diffraction equation (condition for maxima) is,
Sin θm= m λ / d
Wheredis the combined width of the opaque region and transparent region of the grating,mis the order,λis the wavelength of laser used andθmis the angle subtended within the central maximum andmthorder maximum.
From this we can find out the slit widthdas
d = m λ / Sin θm
Radius of the Airy’s disc,
x = ( 1.22 l λ ) / a
where,
a= Diameter of the aperture (pinhole),
l= Distance between the pinhole and the Screen,
λ= Wavelength of light,
x= Radius of the Airy’s disc
Thus we can find the diameter of the aperture (pinhole) using the equation
a = ( 1.22 l λ ) / x
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