$2 Sketch Portrait Maker

Step 3 Finding the right height for cuts

 Step 1 : Now put your display  brightness of mobile phone, etc. to highest and put it facing downward on the cut you made on the box then bring the smaller lens below it as shown in fig. and adjust it by moving it up & down so that you see the image of mobile screen display on the base of the shoe box clearly. (it will not be that clear therefore we will use second lens)

Step 2 : Now you know where to set the smaller lens you have to make a cut on the shoe box(see fig)and after sticking the smaller lens to the cut you made earlier using tape(tape it only sidewise not in the centre of lens) place it in the cut on the shoe box.

Step 3 : Now bring the second bigger lens below the smaller lens (which you just fixed in step 2)
and adjust it the same way as in step 1&2 to get a clear image(this time it will be really clear) and fix it in the shoe box same as in step 2.