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Second question;
If the surface is black, how will the centerline be provided?

Final comment for today. This website can be helpful to simulate different solutions. I made some test cases for the kids to try out. Files can be saved. In these cases, mirrors reflect on both sides, so just come up with a way to indicate which side is reflective. Clearly some can hit all three mirrors, but other setups only allow you to hit 2.

https://ricktu288.github.io/ray-optics/simulator/

Enjoy!

I’m surprised no one has mentioned this, but here’s a very important question:

When the barriers are placed, will they always be perpendicular to the line of sight from the perspective of the mirror? As in, will they always be at 90 degrees with the laser, or Can the ES place them at any angle relative to the laser? Because there’s a huge difference in strategy in preparing for clear cut 90 degree or 45 degree mirror angles for barriers vs having to use a protractor to measure what angle the ES decided to place the barriers (or would they tell you?)

jajefan wrote:I’m surprised no one has mentioned this, but here’s a very important question:

When the barriers are placed, will they always be perpendicular to the line of sight from the perspective of the mirror? As in, will they always be at 90 degrees with the laser, or Can the ES place them at any angle relative to the laser? Because there’s a huge difference in strategy in preparing for clear cut 90 degree or 45 degree mirror angles for barriers vs having to use a protractor to measure what angle the ES decided to place the barriers (or would they tell you?)

The ES can place it at any angle. It can be at 90 or 45 or 3.141592 (theoretically) degrees.
I don't think they'll tell you, but some might.
Check out the rules.

dmackSD wrote:Final comment for today. This website can be helpful to simulate different solutions. I made some test cases for the kids to try out. Files can be saved. In these cases, mirrors reflect on both sides, so just come up with a way to indicate which side is reflective. Clearly some can hit all three mirrors, but other setups only allow you to hit 2.

https://ricktu288.github.io/ray-optics/simulator/

Enjoy!

This is amazing!

I took our box from last year to our local Sheet metal store and got a very nice plate custom cut for a $6.09 out the door. Worth the trip rather than trying to cut one ourselves! Figure we will practice magnetized with the magnets down and non'magnetized with the mirror upside down.

Can you touch the barrier as long as you don't move it? Will the barrier or mirrors have magnets on the bottom? What will happen if you move the barrier (how many points will be deducted) ? What do they consider as moving the barrier? By an inch or a centimeter?

SawnEcho wrote:Can you touch the barrier as long as you don't move it? Will the barrier or mirrors have magnets on the bottom? What will happen if you move the barrier (how many points will be deducted) ? What do they consider as moving the barrier? By an inch or a centimeter?

1. It'll probably depend on the proctor (I think). Some proctors tape down the barrier, so in that case touching it should be okay.
2. It's not required, but some might.
3. I don't know. In some cases, you could get a 0 for the laser shoot part I think.
4. Again, depends on the proctor.

Once at states my partner knocked the barrier over completely but they let us proceed.

Froggie wrote: The ES can place it at any angle. It can be at 90 or 45 or 3.141592 (theoretically) degrees.
I don't think they'll tell you, but some might.
Check out the rules.

Sorry, I thought rule 3.j was ambiguous as to whether or not nonperpendicular angles referred only to the midline barrier or to the other barriers as well. Thanks for clarifying.

Hellloooooooo,
For Div. B, is it necessary to know the percentage of reflection in a refractive problem? (in refraction part of the incident ray, part of it is reflected). Basically do we need to know the percentage that is reflected. (sorry if this is very confusing). I JUST NEED TO KNOW!!!!!