Multiple reflections | How does kaleidoscope work? | Class 7 Science (CBSE/NCERT)

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Multiple reflections of light are the reflection of light back and forth several times between the two reflecting surfaces. The reflective surface is given by y=2sinx. The reflective surface is facing a positive axis. What are the least values of co-ordinate of the point where a ray parallel to positive x-axis becomes parallel to positive y-axis after reflection?

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