Power of a lens:

$\overline{){\mathbf{P}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{f}}}$, where f is the focal length of the lens.

The paper should be at the focus of the lens.

How far from a piece of paper must you hold your father's 2.25 D reading glasses to try to burn a hole in the paper with sunlight? (Answer in cm)

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Thin Lens And Lens Maker Equations concept. You can view video lessons to learn Thin Lens And Lens Maker Equations. Or if you need more Thin Lens And Lens Maker Equations practice, you can also practice Thin Lens And Lens Maker Equations practice problems.