Since I want to become an optometrist, I wanted to discover what would happen if you placed a paper over a lense that was shining the image on a screen. The image becomes dimmer. This is becase the paper is covering half the numeber of photons that are coming in through the lens, making the image less bright. Blocking a portion of the lense reduces the number of phtons that are refracted by the lens, which relates to the intensity of the image. Intensity related to brightness which explains the dimmer image. Lenses are very cool to learn about. There are many different kinds of lenses, convergent and divergent. These lenses change the placing of the image, as it could be virtual or real, depending on the type of lens.
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