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Question

You have three opaque strips with very small holes of different shapes as shown in the figure. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?

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Solution

Explanation:

  1. The holes in the strips operate as a pinhole camera and the strips are opaque, all the objects will provide the same image of the sun, regardless of their shapes.
  2. The little holes in the strips will operate as a pinhole camera regardless of their shape, the same small circular image will be acquired in all three circumstances.
  3. Furthermore, because light travels in a straight line, the Sun's image will be the same in all circumstances.

Hence, the image formed by these small holes will be same.


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