Glass Block (Rectangular) Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4564
Jlab Export is a leading Glass Block (Rectangular) Manufacturer,and suppliers in India
Glass Block (Rectangular) (code EL-SLE-4564) is a rectangular glass block with uninterrupted, bubble-free surfaces, used to study the refraction and reflection of light in school and college physics labs. It is listed in two sizes, including 100 x 60 x 18 mm, and every block is packed in its own labelled packet for safe storage between practicals. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Shape | Rectangular |
| Surfaces | Uninterrupted, bubble-free |
| Sizes | 100 x 60 x 18 mm; 115 x 65 mm (ask JLab to confirm the thickness of this larger block) |
| Use | Study of refraction and reflection of light |
| Packing | Each block in an individual labelled packet |
| Quality check | Each glass block is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4564 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Glass Blocks?
| Model | Size | Listed details |
|---|---|---|
| This glass block (EL-SLE-4564) | 100 x 60 x 18 mm, or 115 x 65 mm | Uninterrupted, bubble-free surfaces; each in an individual labelled packet |
| Glass Slab | 75 x 50 x 18 mm | Rectangular; all sides polished; slightly greenish glass free from bubbles |
| Glass Block Rectangular 75 mm x 50 mm x 18 mm JLab | 75 x 50 x 18 mm | Bubble-free glass sheet; optically polished on all sides; edges slightly bevelled |
Choose this block when you want a larger face than the 75 x 50 mm slabs — a wider block gives longer ray traces on the paper, which makes the angles easier to measure. The smaller slabs suit tight bench space or students who keep their own kit.
What Is the Rectangular Glass Block Used For?
The glass block is the standard optics lab equipment for the class 10 practical on tracing the path of a ray of light through a rectangular glass slab for different angles of incidence. Students lay the block on white paper on a drawing board, trace its outline, fix two optical pins along an incident ray, sight them through the opposite face and fix two more pins in line. With the block removed, joining the pin marks shows the ray bending towards the normal as it enters the glass and away from it as it leaves, so the angles of incidence, refraction and emergence can be measured. Because the two long faces are parallel, the emergent ray comes out parallel to the incident ray but shifted sideways — the lateral displacement, which grows with the angle of incidence and the thickness of the block.
In class 12 and college labs the same block is used to find the refractive index of glass, either from Snell’s law (the sine of the angle of incidence divided by the sine of the angle of refraction) or by comparing real and apparent depth with a travelling microscope. A faint reflected ray from the front face also shows partial reflection. Keep each block in its labelled packet, wipe it with a soft cloth, and avoid sliding it on gritty benches, since scratches and chipped edges spoil the ray trace.
What to Specify When Ordering
- Size — 100 x 60 x 18 mm or the larger 115 x 65 mm block; ask JLab to confirm the larger block’s thickness when quoting.
- Quantity — the minimum order is 10 blocks; for the class 10 ray-tracing practical many schools plan one block per student or per pair.
- Accessories — add optical pins, and other optics such as prisms and semicircular blocks, to the same enquiry.
Frequently Asked Questions
What sizes is the glass block available in?
Two sizes are listed: 100 x 60 x 18 mm, and a larger block with a 115 x 65 mm face. Ask JLab to confirm the thickness of the larger block in the quotation.
Which school experiment uses a rectangular glass block?
The class 10 experiment of tracing the path of a ray of light through a rectangular glass slab for different angles of incidence, and measuring the angles of incidence, refraction and emergence.
Why does the ray come out parallel to the ray going in?
Because the entry and exit faces are parallel: the bending towards the normal on entry is reversed by the bending away from the normal on exit. The ray is only displaced sideways, not turned.
How can the refractive index be found with it?
Divide the sine of the angle of incidence by the sine of the angle of refraction from a ray trace, or divide the real thickness of the block by its apparent thickness measured with a travelling microscope.
Why does bubble-free glass matter?
Air bubbles inside the glass scatter and deflect light, which blurs the pins seen through the block and makes the ray trace unreliable. The listing describes these blocks as having bubble-free, uninterrupted surfaces.
How are the blocks packed?
Each block comes in its own labelled packet, which protects the faces and makes it easy to identify the size on the shelf.
What should I send for an export quotation?
The size and quantity, destination country and port or city, delivery terms such as FOB or CIF, packing or labelling requirements, and a tender reference if there is one.
Who manufactures this glass block?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, makes it at its works in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, an Indian manufacturer of optics and physics lab equipment for schools and colleges, incorporated in 2017 and located on Hargolal Road, Ambala, Haryana. The glass block is produced at JLab’s own works, not bought from a trader, so schools, colleges, dealers and importers buy it factory-direct, each block is visually inspected and packed in its labelled packet before dispatch, and repeat orders come from the same manufacturer. JLab holds MSME Udyam registration UDYAM-HR-01-0003849 as a manufacturing enterprise and exports under Importer-Exporter Code 3317504552. JLab exports worldwide and ships to buyers in every region — Benin in West Africa, Malawi in East Africa, Vanuatu in Oceania, Mexico in North America and Costa Rica in Central America and the Caribbean, for example. Tender buyers can refer to the JLab lab tenders page.
Optics Items for the Same Practicals
- Optical Pins — chrome-plated pins in a plastic box, for marking ray paths through the block.
- Prism Glass — clear glass right-angle and equilateral prisms for refraction experiments.
- Semi Circular Block Glass — a polished semicircular block for demonstrating total internal reflection.
- Glass Slab — a smaller rectangular slab with all sides polished.
Browse more optics and physics apparatus in the School Lab Equipment range.
Request a Quote
JLab quotes directly as the manufacturer. Use the Add To Cart enquiry button on this page, or send the size and number of blocks (minimum 10 units), any pins or prisms you need, and your delivery location through the contact page.
Last updated: 4 October 2026
