The hole in the center of the iris through which light can pass is called the pupil.
Light travels through the hole in the black paper as the paper blocks the light's path except for the hole, allowing a beam of light to pass through. The beam of light will be more focused and directional due to the small size of the hole.
The stage in a microscope holds the specimen, usually on a slide, and has an opening in it to permit light to come up through the stage and through the specimen and further on up to the optics.
Mirror reflect the light that enters into it. The plane surface area of the mirror through which the light rays enter is called aperture. If we place some opaque object with hole in its center , in-front of the mirror now light can enter only through this hole. Now the aperture of the mirror is reduced.
Not all galaxies have a black hole at their center. Some galaxies, like our own Milky Way, do have a supermassive black hole at their center, while others do not.
No, the sun does not orbit a black hole in the center of our galaxy. The sun orbits around the center of the Milky Way galaxy, where there is a supermassive black hole called Sagittarius A.
the name of the hole that allows light to go through into your eye is: pupil
Light travels through the hole in the black paper as the paper blocks the light's path except for the hole, allowing a beam of light to pass through. The beam of light will be more focused and directional due to the small size of the hole.
They are hollow so light can pass through to the retina, so you can see. The pupil is the opening in the iris. To ask why the eyes' pupils are hollow is analogous to asking why a donut hole is hollow.
a singularity
yes, the ability of light to travel through the cable is what makes it useful. There is not some sort of hole in the center of the cable, it is a solid glass cable.
The pupil .
The center of a black hole is called a singularity, where a huge amount of matter is crushed into a single point. That's scary, isn't it?
the glory hole, duhhhComment: It's not the 'glory hole' so 'duhhh' to you too!
no
Light first enters the eye through the cornea, the clear outer covering of the eye that helps to focus light. The cornea then bends the light and directs it through the pupil, the black hole in the center of the colored iris.
The supermassive black hole in the center of our Milky Way is at a distance of about 28,000 light-years. The nearest known stellar black hole is at a distance of about 3000 light-years.
A shape with a hole in it is called a "torus." It resembles a donut-shaped figure, with a hole in the middle that runs through the center.