Physics Lab Equipment

LEOK-7 Laser Optical Demonstration Instrument

LEOK-7 Laser Optical Demonstration Instrument


  • 47 experimental demos

  • Cost effective solution

  • Detailed instructional manual

  • Easy alignment


The LEOK-7 Laser Optical Demonstration Instrument is developed as a low-cost solution to lower class optical education at universities and colleges. It provides a complete set of optical and mechanical components as well as a light source.


A laser beam emitted from a diode laser is expanded by a cylindrical lens, and is further split into three equally intense beams by a beam splitter assembly. The position and direction of each beam can be adjusted independently from other beams as viewed on a white board. A rotational disk with angular scales is located at the center of the board with a hole in the disk center for mounting various optical components. By inserting various components into the optical path, numerous optics experiments can be demonstrated covering ray optics, imaging optics, and optical instruments. 

A list of 47 experimental demos can be conducted as follows:


1. Rectilinear propagation of light rays

2. Independent propagation of light rays

3. Law of light reflection

4. Beam expansion by a convex lens

5. Beam expansion by a cylindrical lens

6. Beam splitting by a beam splitter

7. Light reflection at a boundary of two media

8. Real image formed by convergent rays

9. Virtual image formed by divergent rays

10. Beam deflection by plane mirror

11. Imaging properties of a double mirror

12. Diffuse reflection of light

13. Law of light refraction

14. Total internal reflection of light

15. Applications of total internal reflection

16. Principle of periscope

17. Minimum deviation angle of prism

18. Displacement of rays through a parallel plate

19. Propagation of light through optical fiber

20. Convergence of light by concave mirror

21. Self-tracing of light by concave mirror

22. Imaging of concave mirror (object distance >2f')

23. Imaging of concave mirror (object distance f'~2f')

24. Imaging of concave mirror (object at focal plane)


25. Imaging of concave mirror (distance < f')

26. Divergence of light by convex mirror

27. Self-tracing of light by convex mirror

28. Imaging of convex mirror

29. Rays passing nodal point of convex lens

30. Demonstrating focal point in object space

31. Light focusing by a convex lens

32. Principle of camera

33. Reversed imaging of unit magnification

34. Principle of projector

35. Principle of collimator

36. Principle of magnifier

37. Imaging of convex lens

38. Imaging of convex lens

39. Imaging of convex lens

40. Imaging of convex lens

41. Imaging of convex lens

42. Divergence of light by concave lens

43. Imaging of prism

44. Principle of Galilean telescope

45. Imaging of Galilean telescope

46. Principle of nearsighted vision correction

47. Principle of farsighted vision correction

*Please click to view some sample pages of the instruction manual.

Part List

Main unitIncl a diode laser (powered by 3 AA batteries), beam expander, beam splitter, whiteboard, dial disk, etc.


Right angle prism Double plane mirror 
Equilateral prism Semi-cylindrical lens 
Concave-convex cylindrical mirrorBeam expander lens
Diffuse reflectorPlastic optic fiber
Plane parallel platePlane mirror
Bi-convex cylindrical lens Plano-concave cylindrical lens
Galilean telescopePeriscope
Plano-convex cylindrical lensPDF manual


Schematic of instrument

1. Laser, 2. Beam expander 3. Beam splitter assembly, 4. Whiteboard 5. Dial disk, 6. Battery box

20151013-145038243640.jpg Principle of vision correction

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