A paperweight in the form of a hemisphere of radius 3 cm is used to hold down a printed page (plain surface down). An observer looks at the page vertically through the paperweight.

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A paperweight in the form of a hemisphere of radius 3 cm is used to hold down a printed page (plain surface down). An observer looks at the page vertically through the paperweight.
07
Oct
A paperweight in the form of a hemisphere of radius 3 cm is used to hold down a printed page (plain surface down). An observer looks at the page vertically through the paperweight. A paperweight in the form of a hemisphere of radius 3 cm is used to hold down a printed page (plain surface [...]
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