The correct answer is
Rays of light can travel through the cardboard when I hold my largest cardboard square between the light source and the wall, but because the cardboard is not very thick, the light can still pass through and create a shadow.
Do cardboard sheets block light?
Based on the precise materials and light sources that were employed, the results of the cardboard experiment frequently differ.
Keep in mind that it is generally expected that reflective materials, such aluminium foil and mirrors, would reflect the specified or given light.
Since the cardboard is not very thick, light rays do penetrate when I hold my largest cardboard square between the light source and the wall. As a result, the cardboard tends to cast a shadow when held in this position.
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