Spherometer
Product Code : LSK-PL-10374
Spherometer (SKU LSK-PL-10374) is a brass three-legged instrument for accurate measurement of the radius of curvature of spherical lenses. A 1 mm pitch screw and a 100-division disc give readings to one hundredth of a millimetre, and the instrument suits Class 11 and college physics practicals. It comes off the Science Lab Supplies shop floor at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and is sold factory-direct to schools, colleges, tender contractors and distributors.
Specifications
Frame, scales, pitch and dial head of the brass spherometer are each given a row in the table. In short, a three-pronged brass table stands on three pointed stainless steel legs, one prong carries a vertical 10–0–10 mm main scale, and the 1 mm pitch screw turns a 40 mm brass dial with a 100-division micrometer scale.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10374 |
| Table | Three-pronged brass table |
| Legs | Three pointed legs, stainless steel |
| Main scale | Vertical, 10–0–10 mm, on one of the prongs |
| Micrometer scale | Brass disc with 100 divisions |
| Pitch | 1 mm |
| Least count | 0.01 mm (1 mm pitch / 100 divisions) |
| Dial head | Brass, 40 mm diameter |
| Purpose | Radius of curvature of spherical lenses |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Spherometer
The spherometer finds the radius of curvature of a lens or curved mirror from the height of the curved surface above the plane of its three legs. It is a listed experiment in the NCERT Class 11 physics lab manual and supports lens and interference practicals at B.Sc. level.
- Class 11 physics: radius of curvature of a given spherical surface, such as the Convex Mirror Optical.
- Class 12 physics: measuring the radii of a lens, for instance the Concave Optics Experiment Lens, for the lens maker's formula.
- B.Sc. optics: radius of curvature of the plano-convex lens used in Newton's rings.
- Teaching pitch, least count and backlash of a screw-based instrument.
Standard Scope of Supply
The spherometer is supplied as a single instrument: brass table with its three stainless steel legs, vertical main scale, 1 mm pitch screw and 100-division brass disc with 40 mm dial head. A flat glass plate or the lenses and mirrors to be measured can be requested on the same quotation.
Packing, MOQ and Lead Time
Tell us whether you need a single spherometer or one for every pair of students, and we will return a quotation showing the packing, delivery time and price for that number. School physics lab equipment in India, such as screw gauges and calipers, can be quoted at the same time.
Science Lab Supplies holds an Importer-Exporter Code as a registered exporter, so it can ship to buyers in Zambia, Rwanda, South Africa, Qatar, Sri Lanka and Vietnam. To price spherometers for your optics practicals, use the contact page, collect them with other items in the enquiry cart, or follow the lab tender page if a tender governs the purchase.
Frequently Asked Questions
What is the least count of this spherometer?
The screw has a 1 mm pitch and the brass disc has 100 divisions, so one disc division equals 0.01 mm, while the vertical main scale counts whole millimetres from 10 through 0 to 10.
What is a spherometer used for?
It is used for accurate measurement of the radius of curvature of spherical lenses and other curved surfaces, by measuring how far the centre of the surface rises or falls relative to the three legs.
Is Science Lab Supplies the manufacturer or a trader?
Brass spherometers of this pattern are produced in the company's HSIIDC Industrial Area plant in Saha, Ambala, India, so Science Lab Supplies is the manufacturer and quotes them itself rather than through a distributor.
Can a glass plate be ordered with it?
Yes. The quotation covers the spherometer itself; if you need a flat glass plate for the zero reading, mention it in your enquiry so it can be added as a separate line.
Related Measuring and Optics Items
Curvature measurement links precision measuring tools with mirror and lens optics. These Physics Lab, Applied Mechanics and Light and Optics products work alongside the spherometer, from screw gauges and calipers to mirrors, lenses and an optical bench, and all of them can be combined on one quotation.
- Concave Mirror — round, unmounted 50 mm glass mirror with vacuum-coated silver backing.
- Micrometer — 0–25 mm screw gauge with an accuracy of ±0.003 mm at 10 mm.
- Caliper Vernier — dual scale reading 0–12.5 cm x 0.1 mm and 5 in x 1/128 in.
- Spherometer Three-leg base — also measures the thickness of thin plates.
- Newton's Ring Apparatus — plano-convex lens on a flat glass plate, pressure set by three thumbscrews.
- Convex Lens 50mm — biconvex lens for focusing parallel rays and forming real images.
- Compact Optical Bench Kit — 1.1 m track in three clip-together parts, stored in a suitcase.
Browse the full Physics Lab range, the Light and Optics range, or all physics lab equipment.
Last updated: 22 October 2026
