This periscope is made from a box containing two mirrors held at 45°. It can reflect light so that you can see over walls and around corners!
What you need
Two small mirrors (both the same size), some card; a protractor for measuring the angles of the mirrors; a ruler; a pencil; scissors; sticky tape; and a box of paints.
Measure the distances shown as ‘a’ and ‘b’ in the diagram. Make sure that the mirror is held at an angle of 45° while you do this (a protractor will help).
The casing
Now you can draw the pattern for your periscope onto the card. Make sure you use the measurements you have just taken. You can make the periscope as tall as you like. Cut around the outline of the pattern. Now draw two rectangles onto your box — like the ones in the diagram. Cut these out to make two openings. Fold the box into shape and hold the edges together with sticky tape.
Fixing the mirrors
Your two mirrors should fit into opposite corners of the box with their shiny sides facing the openings. Use strips of card to keep the mirrors in place, whichever way up you hold the periscope. Decorate the box as you choose. Your periscope is now ready to use. Just look into the bottom opening and see what you can see!
Picture Credit : Google