Q24 of 112 Page 310

Name an instrument or toy which works by producing multiple reflections from three plane mirrors to form beautiful patterns.

Kaleidoscope is the instrument that works by producing multiple reflections. It consists of 3 plain mirrors inside a tube (cylinder) with colored glass pieces at one end and a glass to view on the other.


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22

How are the two plane mirrors in a periscope arranged:

(a) with respect to one another?


(b) with respect to sides of the tube?

 23

What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other?

 25

State one use of kaleidoscope.

 26

Name the device used to split white light into seven colours.