Which structure is an opening that regulates the amount of light that enters the eye?

The iris in a human can be

What are the functions of eyelids and eyelashes

What am I? I am part of the eye ... I am a black layer containing lots of blood vessels ... select the correct answer.

What am I? I am part of the eye ... I am transparent jelly like substance which supports the back of the eye ... select the correct answer.

What am I? I am part of the eye ... I am the most sensitive part of the eye ... select the correct answer.

What am I? I am part of the eye ... I am the inner light sensitive layer that contains rods cells that work in dim light and cone cells that detect colour and detail ... select the correct answer.

What am I? I am part of the eye ... I am the coloured part of the eye that controls the amount of light entering the eye... select the correct answer.

What am I? I am part of the eye ... I can change shape to focus light onto the retina ... select the correct answer.

What am I? I am part of the eye ... I am the tough, white, protective layer of the eye ... select the correct answer.

What am I? I am part of the eye ... I am the part of the eye that carries nerve impulses away from the eye to the brain ... select the correct answer.

Light travels in a __________ line until it refracts off an object.

What is letter B pointing to?

What is letter F pointing to?

The path light takes through the eye....