Glass Lenses - Double Concave
Product Code : JL-LE-11405
The Glass Lenses - Double Concave listing (SKU JL-LE-11405, Cat. No. JSS-361/0291) is a round double concave lens, 50 mm in diameter with a focal length of 100 mm, for ray optics work in school and college physics. It is spherical, optically worked glass with ground edges and polished faces. As a diverging lens it spreads parallel rays so they appear to come from a virtual focus, which students trace with ray boxes or pins. A double convex lens is listed below for converging-lens work.
Specifications
Specifications as listed for this lens:
| Product | Glass Lenses - Double Concave |
| SKU | JL-LE-11405 |
| Cat. No. | JSS-361/0291 |
| Material | Glass, optically worked |
| Type | Double concave, spherical |
| Diameter | 50 mm |
| Focal length | 100 mm |
| Shape | Round |
| Finish | Ground edges, highly polished |
| Property | Chemical resistant |
Experiments with the double concave lens
- Showing how a diverging lens spreads a beam of light
- Finding the focal length of a concave lens using a convex lens in combination
- Studying virtual, upright and diminished images
- Modelling the correction of short sight (myopia) with a diverging lens
Scope of supply and ordering
Supplied as a single 50 mm lens; lens holders and optical benches are separate items, and quantities are set on the quotation. Several lenses of the same focal length can be supplied for group practicals.
Frequently asked questions
What is the focal length of this concave lens?
100 mm, with a diameter of 50 mm.
How can its focal length be measured in class?
Commonly by combining it with a convex lens of shorter focal length and measuring the focal length of the pair.
Are the edges finished?
Yes, the edges are ground and the surfaces highly polished.
Related products
More optics apparatus is in our laboratory equipment range.
Request a quote
Ask for a price on the 50 mm double concave lens through our contact page. Tender and project enquiries can be sent through the tenders page.
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