Question

Function of optic nerve in human eye:
$\left(A\right)$ Images are modified by the optic nerves.
$\left(B\right)$ Electric signals are generated on the retina are carried by the optic nerve of the brain.
$\left(C\right)$ Image brightness is reduced by the optic nerve.
$\left(D\right)$ All of the above.

Answer 1

Hint: The function of the optic nerve is to transfer visual input from the retina via electrical impulses to the brain's vision centers. So using this definition to get the problem solved.

Complete Step-by-Step solution:
In the back of the eye is the optic nerve. Sometimes known as the second cranial nerve, or cranial nerve II. This is the second of a number of cranial nervous pairs. The optic nerve's job is to transfer visual information from the retina through electrical impulses to the brain's vision centers.
The optic nerve exits the orbit (eye socket) through the optic tube, flowing postero-medially through the optic chiasm where, in both eyes, the fibers from the temporal visual fields (the nasal hemi-retina) are partly decut (cross-over).
Hence, the optic nerve of the brain bears electrical signals on the retina.
So this is the required answer.
Hence option (B) is the correct answer.

Note – The light sensitive cells of the retina get activated with the incidence of light and generate electrical signals. The electric signals are sent to the brain by the optic nerve and the brain interprets the electric signals in such a way that we see an image which is erect and the body is of the same height.