Optical metric

Optical metric is a way of measuring distance or space using light. Imagine you have a toy car and you want to know how far it can go before it stops. You could use a ruler to measure the distance it travelled. But with optical metric, you use a special machine that sends out a beam of light and measures how long it takes for the light to bounce back. The machine knows how fast light travels, so it can figure out how far away the object is based on the time it takes for the light to come back. It's like playing a game of "Marco Polo" with light! Optical metric can be used to measure things that are too far away or too small to measure with a ruler. It's often used in science and engineering to make very precise measurements.