Journal Entry 9/10

1. What is the path of light rays from the laser to the screen? How can you tell? - It was straight because we could see the beam and it was focused straight. You could tell because otherwise we would've seen the beam before it hit the wall.
   
2. Why can you see the spot on the wall?- We can see the spot on the wall because it hits the wall and reflects the light beams back in every direction, ultimately hitting everyones eyes.
   
3. Where can you stand to see the spot on the wall? What does this mean about the rays reflected from the wall?- You can see the light from anywhere in the room, which proves that the beams are reflected in every direction.
   
4. Why can’t you see the beam of light before it hits the screen?- Because there is nothing for the light to bounce off of we cannot see the beam.
   
5. What do you observe when chalk dust is sprinkled in the beam? How can you explain this?- we see the laser beam and what explains that is that the little particles of dust reflect the light and we see it.
   
6. Summarize the conditions necessary for you to see something - there must be a source of light and there must be something for the light to bounce off of.