Question

why are patterns made inside a kaleidoscope

Answer 1

Inside a Kaleidoscope, 3 mirrors are placed at an angle of 60°. There are some colourful glass pieces present inside it. As a mirror reflects light of them, the reflection acts as an object of 2nd mirror and its reflection acts as an object for 3rd mirror and so on. Therefore, an infinite number of images form inside a small toy. When we see those images, they appear as some beautiful patterns.