Friday, October 15, 2021

Light-Reflection and Refraction | Class 10 | Activity 10.11 with Solution

Light-Reflection and Refraction | Activities in Text Book with Solution

Activity 10.11

CAUTION: Do not look at the Sun directly or through a lens while doing this Activity or otherwise. You may damage your eyes if you do so.

Hold a convex lens in your hand. Direct it towards the Sun.

Focus the light from the Sun on a sheet of paper. Obtain a sharp bright image of the Sun.

Hold the paper and the lens in the same position for a while. Keep observing the paper. What happened? Why? Recall your experience in Activity 10.2.

✅ Answer: The paper begins to burn and may catch fire.

The parallel rays of light from the Sun are converged by the lens at the sharp bright spot on the paper. It generates heat and causes the burning of paper. 

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