Quick Answer: Laboratory Spherometer Apparatus is a mechanical instrument with three fixed legs and a central micrometer screw for finding the radius of curvature of spherical surfaces and small differences in thickness or height.
Last updated: October 2026
Key Features
Three fixed legs set a reference plane
Central micrometer screw measures small vertical displacement
Pitch and circular scales for manual reading
Measures convex and suitable concave spherical surfaces
Supplied with a plane glass reference plate, storage case and instruction sheet
Technical Specifications
Specification
Value
Instrument type
Mechanical curvature and height-measuring instrument
Measuring arrangement
Three fixed legs with one central micrometer screw
A first reading is taken on the flat glass plate and a second on the curved surface; the central height difference is then combined with the mean leg separation in the standard radius-of-curvature formula. In Light And Optics practicals it is used mainly on convex lens surfaces, and it also teaches pitch, least count and zero-error correction.
Frequently Asked Questions
Q1. How is the least count of the spherometer worked out? Divide the pitch of the screw by the number of divisions on the circular scale.
Q2. Can the Laboratory Spherometer Apparatus measure thickness? Yes. Used with a flat reference surface, it can measure small differences in thickness or height.
Alongside Indian institutions, Lab Equipments Ambala serves export buyers in Serbia, Eswatini and the Gambia.
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