Steps to be followed
Step 1: Fill a drinking glass with water.
Step 2: Use the marker to draw an arrow on the paper.
Step 3: Move the paper behind the glass. What do you notice?
The arrow points in the other direction behind the glass! This is because of a phenomenon called refraction. When light moves from one medium to other, it's direction changes. Here because of multiple refractions, the direction gets reversed.This is why you see a mirror image of the arrow through the glass.
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