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Question

Which of the following is not an advantage of having two eyes?
  1. It gives a wider field of view.
  2. The ability to detect faint objects is enhanced with two detectors instead of one.
  3. It gives the ability to interpret the closeness of an object.
  4. It gives the eye higher protection from dust and pollution.

A
The ability to detect faint objects is enhanced with two detectors instead of one.
B
It gives a wider field of view.
C
It gives the ability to interpret the closeness of an object.
D
It gives the eye higher protection from dust and pollution.
Solution
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There are several advantages of having two eyes instead of one.
(i) It gives a wider field view because human being has a horizontal field view of about 150o with one eye and of about 180o with two eyes.
(ii) The ability to detect faint objects is enhanced with two detectors instead of one.
(iii) With one eye, the world looks flat, i.e., two-dimensional-only. With two eyes, the view is three-dimensional.
As our two eyes are separated by a few centimeters, each eye observes a slightly different image. Our brain combines the two views into one and we get to know how close or far away the things observed are.
Thus, option D.

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