So there are two objects above, with a light beam shining at them. The first object, the fishbowl, is a transparent object, so the light can go through it. The other object, the dead fish, is an opaque object, so the light cannot go through it. Light acts as an electromagnetic wave, and does not need a medium to travel, which is why it is able to travel through air ! (and water, and empty space, etc)
your drawings are the so creative! Great blog post!
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