Please explain the "Fix two more pins" step and also explain how the straight line to fix the other two pins is to be considered. The image is from Activity 11.1, NCERT Science textbook, Page Number 192, Chapter: Human Eye and the Colourful World.

Dear student,
When you look from the AC face of the prism, you will see the images of pin P and Q inside the prism. Now just put other pins in the same line as the image.


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