Focal length of a concave lens (lens-combination method)
Combine a convex and a concave lens on an optical bench, measure the combined focal length and find f of the concave lens.
About this experiment
| Subject | Physics |
|---|---|
| Class | 12 |
| Chapter | 9. Ray Optics and Optical Instruments |
| NCERT section | Practical |
| Level | NEET level |
| Time | about 14 minutes |
| Access | Included in a PractiSci plan |
What you do in the lab
Change the controls and watch the physics behave in real time in 3D. Live readouts and graphs show the numbers behind it, and the Learn tab has the theory, procedure, observations and viva questions. Works on a phone or a laptop, in English and Hindi.
Topics: optical bench · concave lens · lens combination · focal length
More from this chapter
- Refractive index of a glass slab with a travelling microscope
- Human eye and its defects (myopia, hypermetropia)
- Convex and concave lenses, lens maker's formula
- Compound microscope and telescopes
- Concave and convex mirrors: image formation
- Optical fibre: acceptance angle, numerical aperture and dispersion
- Prism: deviation curve and dispersion
- Rainbow: refraction and internal reflection in a water drop