The eyeball is approximately spherical in shape with a diameter of about:

Correct option is C

Ans. (c)
Sol. The human eyeball is roughly spherical in shape with an average diameter of about 2.3 cm (23 mm). It fits snugly within the bony orbit of the skull and is protected by surrounding tissues. The actual size may slightly vary, but 2.3 cm is considered standard in adults.
Explanation of each option:
· (a) 3.0 cm – Overestimated; too large for a normal adult eye.
· (b) 1 cm – Too small; typical for a newborn, not an adult.
· (c) 2.3 cm – Correct answer. Standard average adult eyeball diameter.
· (d) 1.8 cm – Slight underestimation; smaller than the normal adult range.