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The glass panel looks like a mirror at night, making the reflected image easier to see when the inside is lit up and the outside is dark. This is because when light falls on the glass, part of it is reflected and part is transmitted. If it is dark outside, the intensity of the light coming from outside to inside is minimal, so one sees their image due to the small amount of reflected light. However, when the light outside is strong, making it difficult to see the image due to the larger amount of transmitted light.