Ring laser

Okay kiddo, have you ever seen a flashlight that shines a beam of light in a straight line? A ring laser is kind of like that, but it uses lasers to make a circle of light instead of a straight line.

To make a ring laser, you need to have four mirrors arranged in a square shape. These mirrors reflect laser light so that it bounces around inside the square. As the light bounces around, it creates a circle of laser light.

But why would anyone want to make a ring of laser light? Well, ring lasers are very useful for measuring things like how the Earth is rotating. When the laser light rotates around the circle, it actually changes slightly because of the way the Earth is moving. Scientists can measure these changes in the laser light to figure out how fast the Earth is spinning.

Ring lasers are also used in other scientific experiments where very precise measurements are needed. They can also be used in navigation systems for planes and ships because they are very accurate at detecting movements and changes in direction.

So there you have it, a ring laser is a special kind of laser that creates a circle of light by bouncing laser light around on four mirrors. It's useful for measuring things very precisely and for helping planes and ships navigate.