When the eyehole is blocked, you are unable to see the eraser inside the box, even when the box lid is open and the light is on. This is because the eyehole is the only source of light entering the box, and without light, you cannot see objects inside the box.
The process of vision relies on light rays bouncing off objects and entering the eye, where they are focused by the lens onto the retina. The retina then sends signals to the brain, which interprets the signals as visual information. In this scenario, when the eyehole is blocked, light cannot enter the box, and therefore, no light rays can reach the eraser or any other objects inside. As a result, the eraser remains invisible to your eyes, regardless of whether the box lid is open or the light is on.
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