Why do the images behind the paper become blurry?—the answer

摘要

In my previous article (Temiz B K 2020 Phys. Educ. 55 027002), I demonstrated that images on a screen covered with paper are seen clearly when the paper is close to the screen but become blurry when the paper is moved away. I wanted you, the readers, to find the reason behind this phenomenon. In this study, I aim to give the answer to this question.