Question

the lens of the eye rounds up ________. a for distant vision b for close vision c when a person is frightened d when sleeping

Explanation:

The ciliary muscles around the eye - lens can change its shape. For close - up vision, the ciliary muscles contract, making the lens more rounded to increase its refractive power. For distant vision, the ciliary muscles relax and the lens flattens. Fear and sleep do not directly cause the lens to round up for vision - related reasons.

Answer:

B. for close vision