Smooth Muscles.
Light bulb
The dilator muscle which makes the pupil larger and the constrictor muscle which makes the pupil smaller.
The iris is the part of the eye that controls the size of the pupil. In bright light, the iris constricts the pupil to reduce the amount of light entering the eye, while in dim light, the iris dilates the pupil to allow more light to enter and improve vision in low-light conditions.
the sun. DAH!!!
The pupil is a little hole in the centre of your eye and when bright light hits the eye the little ring round the eye that can be different colours on different peoples eyes closes over to let les light in. that's why your pupil goes smaller in bright light and when its dark the ring ( iris ) opens wide to try and let more light in.
Moon takes light from the sun and it absorb and reflect so it looks bright.
When a bright light, like the sun, makes you sneeze.
because of the suns bright light shining on the surface of the moon
the iris
You should use light bright enough to see your study material well, but not so bright that it makes a glare and hurts your eyes.
because the light is so bright it makes it look black
um it depends if you have light skin pink brown skin something bright bright