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Introductory Physics Volume Two

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164 Geometric Optics 8.5<br />

Eye<br />

Tank<br />

Front<br />

Front View<br />

Both View<br />

Side<br />

View<br />

Side<br />

The dark grey region is the part of the tank that can be seen from both<br />

the front and the side. You can actually see around the corner. This is<br />

really weird. So if you want a wider view from your window, you could<br />

just fill your room with water. Remember to also install the air tanks.<br />

§ 8.5 Virtual Image Caused by Refraction<br />

Consider a shiny coin on the bottom of a swimming pool.<br />

Air<br />

Water<br />

The light comes up from the coin and out into the air. When the light<br />

comes out it spreads out more. This looks similar to the rays reflected<br />

from a mirror. This similarity leads one to wonder if there is a virtual<br />

image of the coin, that is, is there a place where all the rays appear to<br />

originate. The following diagram traces the rays back into the water.

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