Question
A student is asked to focus sunlight using two different lenses onto a paper.
Image

Observe the image carefully and answer the following questions.
(i) State the name for the shape of lenses X and Y.
(ii) Which of these two lenses can be used to magnify images?
(iii) Explain the changes that happen to the paper kept under both the lenses.

Answer

(i) Lens X → Concave
Lens Y → Convex
(ii) Lens Y is convex in nature. Hence, it can be used to magnify images.
(iii) The paper under lens X will remain as it is. But in case of lens Y, due to its converging nature, the sun rays will be focussed at a point. Ultimately, the paper will start burning.

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