Question

If the light source in front of an eye becomes bright suddenly,

• A. Focus of lens will change
• B. Retinal blood supply is cut
• C. Vitreous humour becomes fluid
• D. Pupil will contract

Answer 1

The correct option is A Focus of lens will change

If the light source in front of eye becomes bright suddenly, then the amount of light entering the eye will increase. The pupil will then adjust to regulate the amount of light entering into eye. The lens will change the focus according to the light entering the eye. The size of pupil is regulated by iris which contracts to decrease the size of pupil. This regulation of light entering the eye by adjusting the size of pupil is called accommodation.

So, the correct answer is 'Focus of lens will change'.