Can a rock reflect light?

Many flat earth advocates mention that the moon emits its own light because rocks “don’t reflect light”.  I’ve done an experiment.

Here’s a decent rock. Not black, not white, just a reasonable gray.

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The experiment setup: a white melamin board as screen, the rock, and a laser pen at right directed at about 45 degree on the rock.

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We don’t see much reflection on this picture, since the flash was used.

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Now, without flash, we clearly see a diffused reflection.

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So the moon reflecting the sunlight is plausible.

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