Convex lenses bulge outwards, bending the light out in a spray (diverging beam). A hand-held magnifying glass is a single concave lens with a handle. These lenses have been used as ‘burning glasses’ for hundreds of years – by placing a small piece of paper at its focal point and using the sun as a light source, you can focus the light energy so intensely that you reach the flash point of the paper (the paper auto-ignites around 450oF).


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2 Responses to “Convex Lenses”

  1. Yes, you’ll want to explore Unit 9 lesson 1. 🙂

  2. Kate Tanaka says:

    My son is really interested in lenses and optics, do you have a course on that in the K – 8 range?