The corneaâs refractive power bends the light rays in such a way that they pass freely through the pupil the opening in the center of the iris through which light enters the eye. The iris works like a shutter in a camera. It has the ability to enlarge and shrink, depending on how much light is entering the eye.ight rays pass through a dense, transparent gel-like substance, called the vitreous that fills the globe of the eyeball and helps the eye hold its spherical shape. In a normal eye, the light rays come to a sharp focusing point on the retina. The retina functions much like the film in a camera.
There are 720 ways in which six things can be arranged. The number of ways that a set of things can be arranged is known as the number of permutations of that set. Each distinct arrangement is called a permutation.
How many dots on full set of dominoes? Each number appears once with every other number and once with blank and once with itself. So for 1 there are 0 - 11 - 12 - 13 - 1 4 - 15 - 16 - 1 and, as the double-1 must bâ¦e included twice, there are eight 1s in a set. Similarly, there are eight of all the other numbers too. So, as 1+2+3+4+5+6 = 21 and 21x8 = 168, there are 168 dots on a blank-to-six set of dominoes.