In bright light the iris of an eye will dilate the pupil.?

Actually, in bright light, the iris contracts to constrict the pupil, reducing its size. This reflex, known as the pupillary light reflex, helps protect the retina from excessive light exposure and improves visual acuity by limiting the amount of light entering the eye. Conversely, in dim light, the iris will dilate the pupil to allow more light in for better visibility.