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.
Light enters the eye through the transparent cornea, where much of the bending of light takes place. The white dot in the pupil is a reflection of light. THE RETINA All this intricate superstructure exists in the interests of the retina, itself an amazing structure.