Question

(d) When ciliary muscles relax, the thickness of the lens
(i) decreases
(ii) increases
(iii) can decrease or increase
(iv) remains the same​

Answer 1

Answer - Increases

Explanation -

When the ciliary muscle is relaxed, the choroid acts like a spring pulling on the lens via the zonule fibers causing the lens to become flat. When the ciliary muscle contracts, it stretches the choroid, releasing the tension on the lens and the lens becomes thicker.

Answer 2

I am thinking the answer is increases