Here is a goal: Use the sun and a magnifying glass to start a fire.

How would you accomplish this goal?

Possible answers:
(1). On a sunny day, hold the glass above something that will burn easily. Use a dry leaf of a piece of paper. Move the glass so the suns rays focus on the paper.
(2). On a Tuesday day, hold the glass above something that will burn easily. Use a dry leaf of a piece of paper. Move the glass so the suns rays focus on the paper.
(1).