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Spherometer

Product Code : SCL-ME-12401

Quick Answer: The Spherometer is a precision measuring instrument for finding the radius of curvature of spherical surfaces and the thickness of thin plates or glass sheets in physics practicals.

Last updated: October 2026

Key Features

Measures the radius of curvature of convex and concave surfaces
Finds the thickness of thin plates and glass sheets
Central screw read on main and circular scales for small height differences
Teaches pitch, least count, zero error and sagitta measurement

About This Product

The central screw is first brought just into contact with a plane glass plate and the main and circular scale readings are noted. The instrument is then placed on the curved surface, the screw adjusted until it touches lightly, and the new reading taken. The height difference, with the distance between the outer legs where the formula needs it, gives the radius of curvature.

Frequently Asked Questions

Q1. What is the sagitta?
It is the small height difference measured by the central screw between a plane surface and the curved surface, used to calculate the radius of curvature.

For a quotation on the Spherometer, contact School Equipments India.

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Spherometer

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