Question: Keep the combined setup shown in the picture undisturbed for half a month. Afterwards, when looking at the text in the book through the area of the ruler that had been in contact with the eraser, what are you most likely to see?
A. Exactly the same as through other parts of the ruler—the text is clear.
B. That area has become completely opaque, and no text can be seen.
C. The text appears significantly magnified, as if viewed through a magnifying glass.
D. The transparency of that area has decreased, and the text appears blurry.
Clues:
1. A transparent plastic ruler is being held.
2. A light-colored, rectangular eraser is placed on top of the ruler.
3. The eraser is in direct physical contact with the surface of the ruler.
4. The ruler has numbered markings and lines for measurement.
5. The area of the ruler under the eraser is currently clear and transparent.
Answer: D
Category: Chemistry