Question

write the uses of periscope and kaleidoscope

Answer 1

Kaleidoscope is used to make symmetric patterns. Fashion designers use this for making different patterns. It is also used as a toy for children.
The main use of periscopes is in submarines that remain under water. While the vessel is in the submerged state, the periscope is used to see things above the surface of the water. This instrument may also be used to view things at a different level, for example, above the heads of a crowd.

Answer 2

The periscope is used in submarines to see what is going on the water surface