Can a convex lens be used to burn a piece of paper? Give reason. [2 marks]

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Solution

Yes, a convex lens can burn a small piece of paper. [0.5 marks]

Convex lens or a converging lens converges the rays of sunlight falling on it at a single point on the paper. Concentrating the rays at a single point can burn a piece of paper. [1.5 marks]

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Take a used ballpen refill and rub it vigorously with a piece of polythene. What happens when we bring the refill close to small pieces of paper. Give a reason for this.
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Can a convex lens be used to burn a piece of paper? Give reason. [2 marks]

Yes, a convex lens can burn a small piece of paper. [0.5 marks] Convex lens or a converging lens converges the rays of sunlight falling on it at a single point on the paper. Concentrating the rays at a single point can burn a piece of paper. [1.5 marks]

Yes, a convex lens can burn a small piece of paper. [0.5 marks]

Convex lens or a converging lens converges the rays of sunlight falling on it at a single point on the paper. Concentrating the rays at a single point can burn a piece of paper. [1.5 marks]