Question

Which part of the eye contracts in bright light and expands in dim light?

cornea

retina

iris

lens

Answer 1

The part of the eye that contracts in bright light and expands in dim light is the **iris**. The iris is the colored part of the eye that controls the size of the pupil, adjusting its diameter to regulate the amount of light entering the eye. In bright light, the iris contracts to make the pupil smaller, while in dim light, it expands to allow more light to enter.