Having two eyes instead of only one accords human beings which of the following vision related advan...........

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Having two eyes, instead of only one, accords human beings which of the following vision-related advantages?

1. Depth of field can be perceived more correctly with two eyes.

2. Width of fields increases with two eyes.

Which of the above is/are correct?

1 only

2 only

Both 1 and 2

none

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Explanation:

Justification: There are several advantages of our having two eyes Instead of one.
• It gives a wider field of view. A human being has a horizontal field of view of about 150 degrees with one eye and of about 180 degrees with two eyes. The ability to detect faint objects is thus enhanced with two detectors instead of one.
• Some animals, usually prey animals, have their two eyes positioned on opposite sides of their heads to give the widest possible field of view.
• Shut one eye and the world looks flat two-dimensional. Keep both eyes open and the world takes on the third dimension of depth. Because our eyes are separated by a few centimetres each eye sees a slightly different image.
• Our brain combines the two images into one, using the extra information to tell us how close or far away things are.