Chapter 6: Activity 1 (73)

Take a transparent glass and fill it with water. Dip some portion of a pencil vertically in water and observe the thickness of the portion of the pencil, in water. Now keep the pencil inclined to water surface and observe its thickness.
⟶ In both cases, the portion of the pencil inside water appears to be thicker than the portion above water. In the second case, the pencil appears to be broken near the surface of water. Why does it happen? The following video explains it ...