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Lenses Cylindrical Glass, Biconcave
Lenses Cylindrical Glass, Biconcave (Product Code: SLE/PHY/108) is a diverging cylindrical glass lens used to spread rays of light apart in ray-tracing and optics experiments in school and college laboratories. Physics students use it to locate a virtual focus on paper, and it has a listed focal length of 75 mm and dimensions of 50 x 45. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Lens type | Biconcave (diverging), cylindrical |
| Material | Glass |
| Dimensions | 50 x 45 (as listed; unit not stated) |
| Focal length | 75 mm |
| Finish | Single, precision finished lens for light and optics experiments |
| Packing | Individually pouched and supplied in a presentation case |
| Product code | SLE/PHY/108 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Biconcave Cylindrical Lens Used For?
A cylindrical lens curves in one direction only, so it turns a flat sheet of light from a ray box into a clear fan of rays on paper rather than bringing it to a point. Stood on its edge in the path of parallel rays, this biconcave lens spreads them outwards; tracing the emerging rays backwards with a ruler shows that they appear to come from a virtual focus on the same side as the light.
Measuring from that point to the lens centre gives the focal length, which students can compare with the listed 75 mm. Placed against the biconvex lens of the same series, it makes parallel rays leave nearly parallel, showing that equal and opposite lens powers cancel. As part of a convex and concave lens set for school optics, it should be handled by its edges and returned to its pouch after use.
What to Specify When Ordering
- Lens type — biconcave, biconvex or planoconvex from the same series.
- Number of lenses per student group or class.
- Whether you need the full three-lens series for comparison work.
- A light source such as a laser pen, if your lab has no ray box.
OEM Manufacturer
This biconcave lens is manufactured by ScienceLab, the trading name of Jain Scientific Equipments Private Limited, at the company's own licensed factory at Saha, Ambala, Haryana, India. Because the maker supplies it directly, laboratories and optics dealers can match further lenses of the same series later, with quotations coming straight from the factory. Find out more on our company profile.
Related Physics Lab Equipment
Complete your cylindrical lens experiments with:
- Lenses Cylindrical Glass, Biconvex — the converging partner with the same 75 mm focal length.
- Lenses Cylindrical Glass, Planoconvex — a converging lens with one flat face.
- Prism – Glass Rectangular Block — compares refraction in a parallel-sided block.
- Laser Pen, Red — a narrow beam for single-ray tracing.
View all lenses, prisms and optics items under Physics Lab Equipment.
Frequently Asked Questions
What is the focal length of the Lenses Cylindrical Glass, Biconcave?
The Lenses Cylindrical Glass, Biconcave has a listed focal length of 75 mm. Because the lens is diverging, this focal point is virtual: students find it by tracing the spread-out rays backwards until they meet on the incoming side.
What are the lens dimensions?
The listing gives the dimensions of the Lenses Cylindrical Glass, Biconcave as 50 x 45 but does not state the unit. If your ray box or lens holder needs an exact fit, please confirm the size with us through the contact page before ordering.
How is the lens packed?
Each Lenses Cylindrical Glass, Biconcave is individually pouched and supplied in a neat presentation case. The pouch protects the finished curved faces from scratches, and the case keeps the lens safe in a school optics cupboard between practicals.
How is a cylindrical lens different from an ordinary spherical lens?
A spherical lens curves in all directions and acts on light around a single point, while the Lenses Cylindrical Glass, Biconcave curves in one direction only. It spreads a sheet of rays into a flat fan, which is ideal for drawing ray diagrams directly on paper.
Who manufactures this biconcave lens?
The Lenses Cylindrical Glass, Biconcave is manufactured by Jain Scientific Equipments Pvt Ltd, trading as ScienceLab, the OEM. It is made at the company's own factory at Saha, Ambala, Haryana, India, and supplied factory-direct to institutions, dealers and importers.
Can I order it with the biconvex and planoconvex lenses?
Yes. The Lenses Cylindrical Glass, Biconcave belongs to a series that also includes biconvex and planoconvex versions. List the quantity of each type in your enquiry, and we will quote the lenses together for your laboratory or dealership.
Request a Quote
Quotes for the Lenses Cylindrical Glass, Biconcave come straight from the manufacturer — contact us or add the lens to the enquiry cart.
Last updated: 24 September 2026
