Concave Optics Experiment Lens
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Product Code : SCL-LAO-12091
Concave Optics Experiment Lens (SKU SCL-LAO-12091) is a 50 mm diameter biconcave crown glass lens with a nominal focal length of −100 mm, used to show how a diverging lens spreads parallel rays and forms virtual images. It serves the Class 12 concave-lens focal-length practical and B.Sc. optics work on an optical bench. Science Lab Supplies grinds and finishes the lens at its unit at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, supplying schools, colleges, tender contractors and distributors from the factory.
Specifications
This table records each specification of the −100 mm concave lens. In summary, it is an equi-biconcave spherical lens in high-purity crown glass with a nominal refractive index of 1.5170, ground edges for safe handling and a 60/40 polish, sized at 50 mm to fit standard lens rings and holders.
| Specification | Value |
|---|---|
| SKU | SCL-LAO-12091 |
| Lens type | Equi-biconcave spherical (diverging) |
| Material | High-purity optical crown glass |
| Diameter | 50 mm |
| Focal length | −100 mm nominal |
| Refractive index | 1.5170 nominal at 589.3 nm |
| Surface quality | 60/40 scratch-dig |
| Edges | Ground perimeter |
| Compatibility | 50 mm lens rings, clips and bench holders |
| Storage | Protective lint-free container |
| Cleaning cloth | Microfibre optical cloth |
| Data card | Technical card with dispersion coefficients |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Concave Lens
On its own the lens forms only virtual, upright, diminished images, so its focal length is found by pairing it with a stronger converging lens that throws a real image onto a screen. It is routine physics lab equipment in India for lens-combination and ray-divergence practicals.
- Class 12 physics: focal length of a concave lens using a convex lens such as the Convex Lens 50mm.
- Tracing divergent rays from a multi-beam source and locating the virtual focus by back-projection.
- B.Sc. optics: thin lens formula checks and simple Galilean telescope models.
- Showing how a diverging lens corrects myopia in introductory biomedical science.
On a plain bench the lens can stand in a Lens Holder With Finished wood, which takes elements from 38 to 50 mm. Hold the glass by its ground rim only.
Standard Scope of Supply
Each concave lens arrives in a protective lint-free container together with a microfibre optical cleaning cloth and a technical data card listing dispersion coefficients. Lens holders, an optical bench and a convex lens for the combination method are separate items that can be quoted with it.
Packing, MOQ and Lead Time
Pricing is available for a single lens or for a batch that covers every bench in your optics laboratory. Science Lab Supplies quotes the packing, delivery time and price for that batch, and matching convex lenses or holders can appear on the same quotation.
As an IEC holder, Science Lab Supplies can ship to buyers in Rwanda, South Africa, Qatar, Sri Lanka, Vietnam and Malaysia. To ask for a price, use the contact page, build a list in the enquiry cart, or follow the lab tender page if the purchase runs through a tender.
Frequently Asked Questions
What does the negative focal length mean?
It shows that the lens diverges light. Parallel rays leave the lens as if they came from a virtual focus 100 mm in front of it, on the same side as the incoming light.
Can this lens project an image onto a screen by itself?
No. A concave lens alone gives only virtual, upright and diminished images. To obtain a real image on a screen, combine it with a stronger convex lens or a converging mirror.
What holder does it need?
The lens has a 50 mm outer diameter, so it fits standard 50 mm lens rings and clips on optical benches, as well as V-slot holders that accept 50 mm elements.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer. The concave lens is produced in its own Saha, Ambala facility, and enquiries are answered by the factory team that makes it, not by a reseller.
Related Lenses, Holders and Bench Items
These products cover other lens sets, holders and bench accessories used with a diverging lens in focal-length and image-formation work. Any of them can be quoted together with the concave lens to complete a set for a school or college physics laboratory.
- Glass Lens Demonstration — six lens types, 38 mm diameter, in a foam-lined wooden box.
- Lens Kit with Stands and Storage Box — diverging lenses of −5, −10 and −20 cm plus three converging lenses.
- Plastic Lens Holder V-shaped — HDPE holder with a 90 degree V-groove and centre index line.
- Wooden Lens Holder — 100 mm upright on a 100 x 50 mm base, lenses up to 76 mm.
- Convex Mirror Optical — 50 mm diverging mirror, also −100 mm focal length.
- Optical Bench Ordinary Physics Lab — supplied with a lens holder ring mount and ground-glass screen.
- Optics Experiment Parallax Pin — brass-tipped needles for image location.
Browse the full Light and Optics range, the Physics Lab range for lens and mirror sets, or all physics lab equipment.
Last updated: 9 October 2026
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