How Lenses Work: VIDEO/DVD, Many people wear glasses to help them see, but how do the lenses in the glasses work? Bob Symes demonstrates the differences in the images produced by flat, convex, and concave lenses. He shows how a lens bends light according to the thickness and direction of its curve.


			How Lenses Work

Many people wear glasses to help them see, but how do the lenses in the glasses work? Bob Symes demonstrates the differences in the images produced by flat, convex, and concave lenses. He shows how a lens bends light according to the thickness and direction of its curve. (8 minutes)

ORDER CODE: FFMBVL1658V
VHS VIDEO

ORDER CODE: FFMBVL1658DVD
DVD