We’ve never heard of this; it sounds similar to the “pinhole” method. For a sharp image, you’d want to tape off part of the mirror to create a small square, say 1/4-inch by 1/4-inch, then project into a darkened room from a certain distance away. We wonder about the clarity of the image and also about the safety. We all know that you shouldn’t look directly at the Sun and wonder if you shouldn’t look directly at the mirror reflecting the Sun’s bright beams either; look only at the projection on the wall or screen.
We’ve never heard of this; it sounds similar to the “pinhole” method. For a sharp image, you’d want to tape off part of the mirror to create a small square, say 1/4-inch by 1/4-inch, then project into a darkened room from a certain distance away. We wonder about the clarity of the image and also about the safety. We all know that you shouldn’t look directly at the Sun and wonder if you shouldn’t look directly at the mirror reflecting the Sun’s bright beams either; look only at the projection on the wall or screen.