Question

when the light intensity decreases which muscles are activated?
ciliany
pupillary constrictor
pupillary dilator
superior and inferior rectus

Explanation:

The pupillary dilator muscle is responsible for increasing the size of the pupil. When light intensity decreases, the body's response is to allow more light into the eye. This is achieved by the activation of the pupillary dilator muscle, which enlarges the pupil. The ciliary muscle is involved in accommodation (focusing on near and far objects). The pupillary constrictor muscle reduces pupil size (activated in bright light). The superior and inferior rectus muscles are extra - ocular muscles that move the eye up and down, not related to pupil size adjustment for light intensity.

Answer:

pupillary dilator