An empty milk carton can be easily converted into a periscope. Wash the milk carton thoroughly with soap and make sure it doesn’t smell anymore. If you don’t wash the carton properly, it will generate foul smell far beyond endurance!
Place the milk carton horizontally on a table and cut it across in two pieces. Measure just ½ inch from the top corner and use a knife to cut open the box, making it look like a shoe box with separate lid.
Now you have to affix the mirrors in the opened milk carton but first of all, you need to incise sufficient place to adjust the mirrors. Place the mirror at the top side of the milk carton and use a marker to trace around it. Do the same at the bottom end but on the opposite side of the carton.
Use scissors to cut out the rectangular tracing but only cut three sides, leaving the fourth side intact to make a flap. Fold the flaps inwards to affix mirrors on them.
Place the mirrors on two flaps using a paper tape and make slanted angles inside the carton. See the bottom opening if you can get a clear view through the top hole and keep adjusting the angles of the flaps until you get a clear view. A 45 degrees angle is ideal for both mirrors.
Use the glue gun to apply glue to the flaps and fix them firmly in their respective position.
Place the lid back onto the carton and seal the edges with paper tape. Your milk carton periscope is ready to use!