Question

how can people help us to adjust when there is dim and bright lights

Answer 1

Iris controls the size of pupil.

In dim light the iris will make our pupil to expand allowing as much light as possible.So more light enters.

In bright light our iris makes pupil to contract allowing less light. so less light enters.

:)

Answer 2

When there is a dim light pupil expand and when there is a bright light pupil contract