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Why does the ear has a pinna ?...

Why does the ear has a pinna ?

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The correct Answer is:
To collect sound waves and direct them inward.
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Middle ear has

Anahat is an eight year old girl who has just begun to learn swimming. At the moment she is in the swimming pool. Suddenly, Anahat finds that her earring has fallen into the water. It appears to her that the earring has not gone too deep. So, she begins to go further into swimming pool to retrieve her earring. Her trainer, who has been watching her movements, does not allow Anahat to go further and pulls her out of the swimming pool quickly. (a) Why does it appear to Anahat that her earring has not gone too deep in water ? Name the phenomenon involved. (b) Why does the trainer not allow Anahat to go further in the swimming pool ? (c) Give one example of the effect of phenomenon involved in the above episode in which a glass slab is used. (d) What values does the trainer show in the above episode ?