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Written by Palak Mall, Senior Content Writer · reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory supply · updated 17 October 2026

Lenses lists 10 items for refraction and image-formation work in school and college physics labs: two boxed sets of six spherical lenses, a set of four cylindrical lenses, single double-convex and double-concave lenses, three lens holders, and a Newton’s rings apparatus with its microscope. The sizes below are the ones given in each listing.

Lens sets

Set	What the listing specifies
Lenses 38mm, Set of Six	Six unmounted spherical lenses 38 mm in diameter, in a wooden box
Lenses 75mm	Six unmounted spherical lenses 75 mm in diameter, in a wooden box
Lenses, Cylindrical	Four cylindrical lenses, 50 mm high x 45 mm wide, focal length about 60 mm: plano-convex, plano-concave, double convex and double concave; clear glass with optically worked faces and ground ends

The two spherical sets have the same contents in two diameters. Each holds one lens of each typical shape: double convex, plano-convex, a converging meniscus, a diverging meniscus, double concave and plano-concave. The lenses are optically worked plate glass with polished faces and ground edges, and the sets are listed for exploring reflection, refraction and combinations of lenses. The cylindrical set focuses light to a line rather than a point, which suits ray-box work on a flat sheet.

Single spherical lenses

The Lenses, Double Convex, Spherical and the Lenses, Double Concave, Spherical are optically worked lenses with ground edges, each offered in a choice of sizes listed on its product page. When ordering, give the size and the focal length needed for each lens. A double convex lens converges light and forms real images on a screen; a double concave lens diverges it, and is usually paired with a convex lens to find its focal length.

Lens holders

Holder	What the listing specifies
Lens Holder, Clip Type	Metal holder with grooved sides to take a lens or mirror; matt black; free standing for bench or general use; for 50 mm lenses
Lens Holder, Metal	Metal holder for lenses and mirrors up to 50 mm in diameter
Lens Holder	Holder for lenses and mirrors up to 75 mm in diameter

The 75 mm holder suits the lenses of the 75 mm set. For the 38 mm set on an optical bench, the Optical Bench Lens Holder Clip Type in Optical Bench & Accessories is listed for a firm grip on 38 mm lenses.

Newton’s rings

Item	What the listing specifies
Newtons Ring Apparatus	Plano-convex lens 63 mm in diameter with a focal length of 2000 mm, on a flat glass plate of the same diameter; both in a metal ring frame with equally spaced compression screws to set the contact
Newtons Ring Microscope	Compact microscope with an 8x Ramsden eyepiece and cross-line graticule; focusing knob for vertical motion; horizontal travel on a cast metal carriage with a micrometer, least count 0.01 mm; built-in light-reflecting unit; lightweight cast aluminium body with a place for the rings setup

In the experiment, the diameters of successive dark rings are read with the microscope, and the wavelength of the light, or the radius of curvature of the lens, follows from them. The long 2000 mm focal length gives the lens a large radius of curvature, which spreads the rings widely enough to read with the 0.01 mm micrometer. A monochromatic source such as a sodium lamp is needed; spectral lamps are listed under Apparatus & Kits.

Related ranges

This range is part of Light & Optics. Concave and convex mirrors and hand magnifiers are under Magnifier and Mirror, benches, screens and bench lens holders under Optical Bench & Accessories, and glass and acrylic blocks, including lens-shaped blocks, under Polarisation and Prisms.

Questions buyers ask

What is the difference between the 38 mm and 75 mm lens sets?
Only the diameter. Both hold the same six shapes in optically worked plate glass, packed in a wooden box.

Which shapes are in the six-lens sets?
Double convex, plano-convex, converging and diverging meniscus, double concave and plano-concave.

What focal length are the cylindrical lenses?
About 60 mm. The set has four lenses, 50 mm high and 45 mm wide.

What does the Newton’s rings microscope read to?
Its micrometer has a least count of 0.01 mm, and the eyepiece is an 8x Ramsden with a cross-line graticule.