Plano Concave Lenses Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-5818
Jlab Export is a leading Plano Concave Lenses Manufacturer,and suppliers in India
Plano Concave Lenses (code EL-SLE-5818) are 25 mm lenses with one flat and one concave face, listed in four powers — 2.5, 7, 14 and 20 dioptres. As diverging lenses they spread a parallel beam of light, and students use them to study virtual images, the power of a lens and lens combinations in school and college optics practicals. They are made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Lens type | Plano-concave (one flat face, one concave face) |
| Size | 25 mm (listed size) |
| Powers listed | 2.5 D, 7 D, 14 D and 20 D (shown with a plus sign in the listing — see the note below) |
| Focal length (magnitude, one over the power) | 2.5 D: 400 mm; 7 D: about 143 mm; 14 D: about 71 mm; 20 D: 50 mm |
| Quality check | Each lens is visually inspected before dispatch |
| Pack quantity | Each (sold individually; state the power) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-5818 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Note on the sign of the power: a plano-concave lens is a diverging lens, and by convention its power and focal length are negative (for example −7 D). The listing shows the powers with a plus sign, so please confirm the lens type and power in your enquiry.
How Do They Compare with the JLab Concave Lens?
| Lens | Shape | How it is specified |
|---|---|---|
| Plano Concave Lenses (EL-SLE-5818) | One flat face, one concave face | 25 mm; by power in dioptres (four powers listed) |
| Concave Lens | Identical concave surfaces on both sides (double concave) | Accurate type; offered in a range of focal lengths |
Both are diverging lenses. Choose the plano-concave lenses when a practical or worksheet works in dioptres, and the double-concave Concave Lens when it is specified by focal length.
What Are Plano Concave Lenses Used For?
A concave lens makes parallel rays spread out as if they came from a focus on the same side as the light, so the image it forms of a real object is always virtual, upright and smaller. In the class 10 chapters on light and the human eye, these lenses show why a concave lens corrects short sight and make the idea of lens power concrete: power in dioptres is one over the focal length in metres, and the powers of lenses placed in contact add up. In senior-secondary and college practicals, a plano-concave lens is combined with a stronger convex lens of known power to find its focal length, and a diverging lens is the eyepiece of a simple Galilean telescope.
Handle the lenses by their edges, clean them with lens tissue or a soft cloth, and store each one separately so the faces do not scratch. Mounted in a lens holder on an optical bench, they stay centred on the same axis as the other optics.
What to Specify When Ordering
- Power — choose from 2.5, 7, 14 and 20 dioptres, and confirm the sign and lens type as noted above.
- Quantity per power — the minimum order is 10 units in total; state how many of each power you need.
- Mounting — lens holders and an optical bench are separate items and can be added to the same enquiry.
- Converging lenses — add convex lenses if students will combine lenses or find the focal length of the concave lens.
Frequently Asked Questions
What powers are available?
Four powers are listed: 2.5, 7, 14 and 20 dioptres, all in the 25 mm size. Their focal lengths are 400 mm, about 143 mm, about 71 mm and 50 mm in magnitude.
Why does the listing show a plus sign for a concave lens?
A plano-concave lens diverges light, so its power is normally written as negative, for example −14 D. The plus sign in the listing should be confirmed with JLab before you order.
What is the difference between a plano-concave and a double-concave lens?
A plano-concave lens has one flat face and one concave face; a double-concave lens is curved on both faces. Both diverge light; for the same power, the single curved face of a plano-concave lens is more strongly curved.
How do I find the focal length of a concave lens in the lab?
A concave lens alone does not form a real image, so it is placed in contact with a convex lens of known and greater power; the combination then forms a real image, and the concave lens’s power is found by subtracting the convex lens’s power from the combined power.
Who manufactures these lenses?
Jain Laboratory Instruments Pvt Ltd (JLab) makes them at its works in Ambala, Haryana, India, and quotes for them directly.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a manufacturer of optics and physics lab equipment in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The lenses are made at JLab’s own works instead of being bought from a trader, so schools, colleges, dealers and importers purchase directly from the manufacturer, each lens is visually checked before packing, and repeat orders in the same powers come from the same maker. JLab exports worldwide and ships to buyers in every region — for example Taiwan in East Asia, Honduras in Central America and the Caribbean, Armenia in Eastern Europe, Saudi Arabia in the Middle East and Norway in Northern Europe. Tender information is on the JLab lab tenders page.
Lenses and Optical Bench Items
- Convex Lens — a converging lens to combine with the concave lens.
- Concave Lens — a double-concave diverging lens specified by focal length.
- Lens Holder — a solid-wood holder that grips both concave and convex lenses.
- Optical Bench Wooden — keeps lenses, mirrors and screens in line for focal-length work.
More optics lab equipment is in the School Lab Equipment range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity of each power (minimum 10 units in total), any holders, convex lenses or optical benches, and your delivery city or port through the contact page.
Last updated: 4 October 2026
