Goniometer Based Apparatus

for Diffraction Experiments

Model: HO-ED-D-03

Goniometer Based Apparatus for diffraction experiments (Model No: HO-ED-D-03) is, designed as a versatile instrument suitable for any optics laboratory. It’s optical rail based construction allows the user to configure it for multitudes of applications.

The apparatus can be used for studying both reflecting and transmitting type diffracting elements. Unlike conventional spectrometergoniometers, all modules in this device are open, simple and easy to assimilate. This feature gives students better understanding.

The apparatus can also be used for many other applications like measurement of prism angles, refraction angle etc., where spectrometergoniometers are generally used. All components are made from corrosion free laboratory grade materials. Optical components are made of research quality N-BK 7 optical glass.

This apparatus consists of a goniometer for measuring diffraction angle directly and a precision adjustable slit through which light passes before falling on the diffracting element. The function of goniometer and positioning stage is to establish and control the geometric relationship between the incident beam, diffraction cell and telescope. The goniometer is also the supporting base to many components, such as the optics, diffraction cell stage, telescope and so on. The equipment is specifically suited for studying elements with considerably greater diffraction angles, like holographic gratings. As the readings are taken through an eyepiece with cross wire, precise results are achieved.

Experiment Examples

Diffraction of light by single slit

The diffraction equation (condition for minima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Diffraction of light by double slit

The diffraction equation (condition for maxima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Diffraction of light by single wire

The diffraction equation (condition for maxima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Diffraction of light by cross wire

The diffraction equation (condition for maxima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Diffraction of light by wire mesh

The diffraction equation (condition for maxima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Diffraction of light by transmission grating

The diffraction equation (condition for maxima) is,

Sin θm   =   m λ   /   d

Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.

From this we can find out the slit width d as

d   =   m λ   /   Sin θm

Features

Modern, versatile and user friendly design

Precision optical Instrument

Related Topics

Single slit

Double slit

Single wire

Cross wire

Wire mesh

Transmission grating
Scope of Supply

Goniometer

Model No: ED-D-03-G
Resolution of prism table
:
10 arc min
Resolution of stage
:
1 arc min
Quantity
:
1 no.

Optical Rail

Model No: ED-D-03-OR
Length
:
500 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.

Slit with Mount

Model No: ED-D-03-SM
Controlling
:
Slit Size
:
0 - 3mm
Quantity
:
1 no.

Collimating Lens with Mount

Model No: ED-D-03-CLM
Focal length
:
202 mm
Diameter
:
50 mm
Quantity
:
1 no.

Cell Mount

Model No: ED-D-03-CM
Material
:
Black anodized Aluminum alloy
Diameter
:
30 mm
Quantity
:
1 no.

Telescope

Model No: ED-D-03-T
Magnification
:
10 X
Quantity
:
1 no.

Diffraction Cells

Model No: ED-D-03-DC
Single slit
:
50 & 100 micron
Double slit
:
100 & 200 micron
Transmission grating
:
30 lines / mm
Single wire
Cross wire
Wire mesh
Pinhole
Quantity
:
1 set.

High Bright LED with Power Supply

Model No: ED-D-03-HLED
Output Power
:
0 - 1 Watt Variable
Wavelength
:
535 nm
Quantity
:
1 no.

Accessories

User Manual
Allen Key