The length of the eyeball is –: (A) 12mm, (B) 16 mm, (C) 20mm, (D) 24 mm
Answer is D. The length of the eyeball is approximately 24 mm, So the distances from the cornea / crystalline lens to the retina and the focal length of optical rays focused by the cornea/crystalline lens propagating in the vitreous humor and imaging on the retina, are also about 24 mm.