Question

What do you mean by kaleidoscope?

Answer 1

It is a tube that has mirrors and loose pieces of colored glass or plastic inside at one end so that you see many different patterns when you turn the tube while looking in through the other end. : a changing pattern or scene.

Answer 2

here goes ur answer my dear friend.
A kaleidoscope is an optical instrument with two or more reflecting surfaces tilted to each other in an angle, so that one or more objects on one end of the mirrors are seen as a regular symmetrical pattern when viewed from the other end, due to repeated reflection. 
hope it helps you dude.
jst chillax..