A magnifying glass works by creating a magnified virtual image of an object behind the lens. The distance between the lens and the object must be shorter than the focal length of the lens for this to occur.
The magnifying glass refracts the ray to a point called focal point. It is where the rays coming from the Sun in a parellel manner gets refracted into the focal area. The heat from the Sun also gets refracted to that focal area. Thus, fire can be ignited through maginifying glass.
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