Answer:The image distance is found using the lens equation, 1/f=1/p+1/q, so 1/1=1/2+1/q 1, so q 1 =2; the magnification is m 1 =-q/p=-1 and the image is real since q 1 >0. Now, as you suggest, insert a diverging lens (red) with f 2 =-3 cm ( f 2 <0) 1 cm to the right of the first lens so that the first image never actually forms.
Step-by-step explanation: