Geometrical Optics Experiment Apparatus

Model: HO-ED-O-02

Holmarc's Geometrical Optics Experiment Apparatus (Model No. HO-ED-O-02) is developed for general physics education in universities and colleges. The compact and fully integrated design makes Holmarc's Geometrical Optics Experiment Apparatus an ultimate tool for the study of the basics of optics.

It includes 1500mm long graduated optical bench with carriers. The optical components such as lenses, mirrors, etc. are fixed to the carriers using suitable mounts so that these can be fixed anywhere on the rail.

Students can easily adjust positions of optical devices using the sliding carriers. All the accessories are easy to be mounted and adjusted. The apparatus includes set of lenses, concave/convex mirrors, light sources like laser, LED etc. The use of diode laser as light source makes the ray path visible and helps students to assimilate the basics easily.

Experiment Examples

To measure the focal length of convex lens, concave lens, convex mirror and concave mirror.

i. Parallel Beam Method

For making the beam parallel, place a concave lens followed by a convex lens in front of the laser. Adjust the position of the convex lens to get a parallel beam and its diameter is same as the diameter of the convex lens throughout. This gives the parallel beam setup.

ii. U-V Method

The relation between u, v and f for a convex lens / concave mirror is

1/v + 1/u = 1/f

where,

u and v is the object distance and image distance respectively; and f is the focal length. Using the proper sign convention, we can find the relation for the focal length of the concave lens / convex mirror.

To verify inverse square law.

The intensity of the light decreases with an increase in the distance between light source and detector.

Iα 1/d2

where,

I is the intensity and d is the distance between the source and the detector.

To verify law of reflection

The law of reflection states that the angle of incidence is equal to the angle of reflection.

To verify law of refraction and to find the refractive index of water

According to Snell's law,

n = sin ⁡i / sin⁡ r

where,

i is the angle of incidence, r is the angle of refraction and n is the refractive index of the medium.

To construct laser beam expander

A laser beam expander is designed to either decrease the laser's beam spot size at large distances or produce a larger collimated output laser beam.

To construct collimator

A collimator is a device that narrows a beam of particles or waves.

To construct simple and compound microscopes

A simple magnifier is called a simple microscope. It's a convex lens. Magnification is given by,

M  =  - v / u

where,

v is the image distance and u is the object distance.
Compound microscope consist of two lenses one as objective and other as eye piece.

Fig. Inverse Square Law

Fig. Schematic Diagram

Related Topics

Inverse Square Law

Law of reflection

Reflection and transmission

Index of refraction
Law of refraction

Beam expansion

Snell’s law

Focal length
Scope of Supply

Goniometer with Detector Mount

Model No: ED-O-02-GDM
Material
:
Anodized Aluminium Alloy
Quantity
:
1 no.

Optical Rail

Model No: ED-O-02-OR
Length
:
1500 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.

Kinematic Laser Mount

Model No: ED-O-02-KLM
Material
:
Anodized Aluminum alloy
:
:
+/-4 degrees
Quantity
:
1 no.

White Screen with Mount

Model No: ED-O-02-WSM
Quantity
:
1 no.

Wire gauze with Mount

Model No: ED-O-02-WGM
Quantity
:
1 no.

Hollow Screen with Mount

Model No: ED-O-02-HSM
Quantity
:
1 no.

Spatial Filter Assembly

Model No: ED-O-02-SFA
Magnification of objective
:
10 X
Positioning
:
Quantity
:
1 no.

Microscope Assembly with Mount

Model No: ED-O-02-MAM
Length
:
10 X
Quantity
:
1 no.

Obstacle with Mount

Model No: ED-O-02-OM
Diameter
:
10 mm
Quantity
:
1 no.

Divergence Lens with Mount

Model No: ED-O-02-DLM
Material
:
Borofloat
Diameter
:
15 mm
Quantity
:
1 no.

Convex Lens with Mount

Model No: ED-O-02-CXLM
Material
:
Borofloat
Diameter
:
40 mm
Focal Length
:
150 mm, 300 mm
Quantity
:
2 no.

Concave Lens with Mount

Model No: ED-O-02-CCLM
Material
:
Borofloat
Diameter
:
40 mm
Focal Length
:
150 mm, 300 mm
Quantity
:
2 no.

Convex Mirror with Mount

Model No: ED-O-02-CXMM
Material
:
Borofloat
Diameter
:
40 mm
Focal Length
:
150 mm, 300 mm
Quantity
:
2 no.

Concave Mirror with Mount

Model No: ED-O-02-CCMM
Material
:
Borofloat
Diameter
:
40 mm
Focal Length
:
150 mm, 300 mm
Quantity
:
2 no.

Glass Tank

Model No: ED-O-02-GT
Dimension
:
50 x 50 x 50 mm
Quantity
:
1 no.

Detector Output Measurement Unit

Model No: ED-O-02-DOMU
Sensor Type
:
Photo Transistor
Display
:
7 segment, 3 ½ digit
Range
:
0 - 199 milli / micro amperes
Quantity
:
1 no.

LED with Variable Power supply (White)

Model No: ED-O-02-LEDP
Output Power
:
0 - 1 Watt Variable
Colour
:
White
Quantity
:
1 no.

Diode Laser with Power supply (Red)

Model No: ED-O-02-DLPR
Wave length
:
650 nm
Optical power
:
5 mW
Quantity
:
1 no.

Accessories

Allen Key
Mercury Sample Bottle
User Manual