English to Greek Science Education / Pedagogy Visual training-optics

χωρίς συγκείμενο αλλά ευρήκα το εξής για κάτοπτρα:

Ray diagrams are drawings that use simple geometry to locate an image formed by a mirror. In order to draw a ray diagram, first sketch the situation; draw the location and arrangement of the mirror and the position of the object with respect to the mirror. Construct the drawing so that the object and the image distances are proportional to their actual size. Then, draw to rays on your diagram. Draw the first ray from the object perpendicular to the mirror's surface. Since it makes and angle of 0 degree with the normal to the mirror, the angle of reflection also equals 0 degree, causing the ray to reflect back on itself.

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