Quick Answer: The Lenses, Spherical Double Concave are bi-concave optical glass lenses with ground edges and polished surfaces. They come in diameters from 38 mm to 100 mm, with focal lengths from 50 mm to 1000 mm.
Last updated: October 2026
Key Features
Spherical double concave (bi-concave) form
Optical glass
Ground edges for handling
Polished surfaces
Diameters 38 mm, 50 mm, 60 mm, 75 mm and 100 mm
Focal lengths from 50 mm to 1000 mm
Technical Specifications
Specification
Value
Form
Spherical double concave (bi-concave)
Material
Optical glass
Edges
Ground
Diameters
38 mm, 50 mm, 60 mm, 75 mm, 100 mm
Focal length range
50 mm to 1000 mm
HS Code
9001.90
About This Product
A double concave lens spreads light out, forming a virtual, upright and diminished image. Students use it on an optical bench to study diverging lenses, to find focal length by combining it with a convex lens of known power, and in lessons on short sight correction.
Frequently Asked Questions
What focal lengths are available for the Lenses, Spherical Double Concave?
Focal lengths range from 50 mm to 1000 mm, in diameters of 38, 50, 60, 75 and 100 mm.
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