新闻稿 -

See Light or Sense Light?

You are standing in a dark room. There is a flashlight on the left pointing to a wall on your right.

1.  I can see light if I look left, directly into it

2.  I can see light if I look right, directly at the wall

3.  But If I look straight ahead, I cannot see the light traveling in front of me. Why not?

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