Complete Kit for Learning Focometry
The Basix Start profile set is designed to introduce students to the principles of optics with quality equipment. The sliders equipped with an indexing mark facilitate precise positioning of the elements, making manipulations clear and reproducible during practical sessions.
Its anodized aluminum profile bench, available in two lengths (2 m and 1.2 m), guarantees robustness and stability, while remaining easy to integrate into school laboratories. This starter set is perfectly suited for exploring focometry and allows for the effective execution of fundamental experiments in middle and high school.
What Educational Experiments Can Be Carried Out Practically?
Image Formation by a Thin Lens
Hands-on activities to understand image formation and fundamental optical relationships.
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Conjugation Laws:
study of the relationship between the object position, image position, and focal length (application of conjugation equations).
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Experimental Demonstration:
observation of the position and size of the image depending on the object-lens distance (concepts of real/virtual image, upright/inverted image, and magnification).
Determination of the Focal Length of a Converging Lens
Several experimental methods suited for school teaching and practical sessions.
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Autocollimation Method:
a converging lens is placed against a plane mirror to obtain a sharp image of the same size as the object but inverted. With this method, the focal length of the lens corresponds to the distance between the lens center and its image.
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Bessel Method:
use of two symmetrical lens positions producing a sharp image; the difference in positions allows calculation of the focal length.
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Silbermann Method: a particular case of the Bessel method also called the 2f-2f method.
Is This Product Suitable for the High School Physics Curriculum?
Yes. The proposed manipulations and protocols (image formation by thin lens, focal length determination by autocollimation, Bessel method, and Silbermann method) directly align with the educational objectives of science teaching in high school—from 10th grade to 12th grade specialized courses. They allow for a progressive and official curriculum-compliant approach to the concepts of conjugation, focal length, and experimental measurements.
Correspondence Between Experiments, Levels, and Curriculum Points
| Experiments | Relevant Levels | Targeted Curriculum Points |
| Image Formation by a Thin Lens | 10th Grade, 11th Grade Specialized | - Qualitative study of optical image formation by converging lenses - Conjugation laws (linking object position, image position, and focal length) - Observation of image size and sharpness depending on object-lens distance |
| Determination of the Focal Length of a Converging Lens | 11th Grade Specialized, 12th Grade Specialized | - Experimental measurements of the focal length of a converging lens - Experimental exploitation and modeling of optical systems - The autocollimation, Bessel, and Silbermann methods deepen the study of focal length, consistent with experimental practices |
What items are included with this setup?
- 1 aluminum profile bench with adjustable feet, 1.2 m (ref. 202959) or 2 m (ref. 202958)
- 4 Basix Start clamps (ref. 202861)
- 1 LED lantern with frosted "d" object, condenser, and power supply (ref. 204596)
- 2 double mounts for profile (ref. 202862)
- 1 set of 4 lenses - 2 mirrors (ref. 682558)
- 1 grid screen (ref. 202955)
What extensions or accessories can be combined with this product to enhance optical bench experiments?
- Diffraction set (ref. 212085)
- Diffraction and interference set (ref. 204337)
- CCD sensor (ref. 209007)
- Clix 360 polarization set (ref. 204338)
- LCD supplement (ref. 204339)