Question

Define
a. sclera
b. optical center.

Answer 1

Answer:

a)the white outer layer of the eyeball. At the front of the eye it is continuous with the cornea.

b)a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.

Explanation:

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