How to make a projecting device

How to make a hand made projecting device?
You need a carton box, a big magnifying glass, cell-phone.
A cell-phone we place into the box, and the magnifying glass will be as an object-glass.
Darken the inside of the box, insert a magnifying glass in the one end and put your smartphone (cell-phone) inside the box.
Image focusing is performed by moving the phone closer and more far relative to the magnifying glass.
If projecting image from the object-glass is upside down, don't worry!!! Just manage how to turn the image on your cell-phone.
Close the cover! Turn down the light! Enjoy!
Transform your mobile device into a big screen
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