I Can See You Through
Question:
Which hole can you see through?
Instructions:
1. Put
your hand in the slit. Look at each hole and find out
which one is not blocked by your hand.
Why?
Normally, light cannot penetrate
opaque objects, including your hands. A set of lens is
installed at the hole in the middle, so that light behind
your hand gets deflected along another path before coming
towards your eyes. This is similar to the workings of
a periscope.
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