Kaleidoscope works on the principle of: 

The kaleidoscope relies on reflectional law.
A kaleidoscope is an optical device with two or more reflecting surfaces inclined to one other at an angle so that repeated reflection causes one or more things (or sections of objects) on one end of the mirrors to appear as a regular, symmetrical pattern on the other. The reflectors (or mirrors) are typically encased in tubes, and one end of the tubes frequently has a cell with colored glass fragments or other transparent (and/or opaque) materials that will reflect light into the pattern being seen. An ever-changing perspective is offered as a result of the materials moving as the cell rotates.

The law of reflection and the combination of VIBGYOR and white light are the fundamental concepts behind the kaleidoscope. White light is reflected off of the surface of the mirror at an angle such that the angle of incidence and the angle of reflection are identical. These lovely patterns are produced as a result of the numerous light reflections.
Uses: A kaleidoscope is an optical toy made up of two mirrors that are angled at a specific angle. Among the kaleidoscope's frequent applications are:
1. Fashion designers employ stunning patterns created by kaleidoscopes.
2. A kaleidoscope is a plaything for amusement.

Hence, the correct answer is option C.