One of the most challenging tasks in the experiment is purchasing convex lenses. I have searched online for organisations including Scientrific Pty Ltd and Francis Lord Optics to get a chance at finding convex lenses.
Discarded websites:
http://www.surplusshed.com/pages/category/educationaloptics_1.html
http://www.nextag.com/concave-and-convex-lenses/compare-html
I am still trying to get better results off ebay but it doesn't show the focal lengths and most of the products are for headlamps. Unfortunately, I might have to make my own by cutting off the handles on magnifying glasses.
If you have any suggestions where I can look for convex lenses and/or opinions please comment.
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