Let's tackle subtraction first. Subtraction in hexadecimal works similar to subtraction in decimal. Let's do a pair of decimal problems and see if we can parallel the solution method in hex. Suppose we want to subtract 1586 - 243 (in decimal).
Refraction of Light Rays. the bending or deflection of light rays as they pass through the various media of the eye that include the conjuctiva, cornea, aqueous humor, lens, and vitreous body.
REFRACTION-Refraction occurs when the light ray changes mediums. Light traveling through air and then going through water is an example of a light ray changing medium. The speed of the light ray changes when it enters a different medium. In most cases the direction of the light also changes. We say the light bends.f the light travels slower then this medium is called the denser medium. If the light ray travels faster then the medium is called the rarer medium. When light enters a denser medium the ray bends toward the normal-when light enters a rarer medium it is bent away form the normal.