Because the surface of the bottle is curved - which bends the light passing through it - just like a magnifying glass does.
If the bottle is left in a place where the sun can shine through it, the bottle can magnify the heat from the sun and start a fire.
The glass bottle can act as a magnifying glass making the characters larger and easier to read.
When you use a microscope it will magnify the object you are looking at.Unwanted publicity can magnify the effect of a small political indiscretion.
You can magnify microscoptic things with a microscope.
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The glass magnifies the script because
glass (depends on shape). water.
Put the glass between yourself and the object you wish to investigate.
Grease the top of the bottle!
there is a convex lens that magnify's what you want
A magnify glass
glass (depends on shape). water.