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How much is our field of view:(a) with one eye open?(b) with both eyes open?
(a) Our field of view with one eye open is about 150º.
(b) Our field of view with both eyes open is 180º.
Explanation
Human beings have two eyes in front of their head, so it provides a horizontal field of view of about 150º with one eye open, and 180º with two eyes open.
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