Physics
Draw a ray diagram to show how a converging lens can form an image of the Sun. Hence give a reason for the term 'burning glass' for a converging lens used in this manner.
Refraction Lens
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Answer
Below ray diagram shows how a converging lens can form an image of the Sun:
The Sun is at infinity so convex lens forms its image at the second focal point which is real and very much diminished in size.
The rays of light from the sun converge to a single point called the focus of the lens. This concentrated image of the Sun burns the paper kept below the lens. Hence, the term burning glass is used for the lens.
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