[Narrator] A common misconception is that as light travels through a transparent object it is unaffected.
However, this is not true. To demonstrate this we will go to a story of two brothers
who discover that light is affected as it travels through transparent objects and you should never presume what you don't know.
Hey Jimmy. Wanna watch Space Blaster? No, let's watch Power Boy instead. It's way better.
Why would we want to watch Power Boy when we could watch the greatest show ever?
Because it's on right now.
[door bell rings]
It that our lasers? I think it is.
I think it is!
I have a package for Timmy and Jimmy Johnson.
That's us. A package for me. Let's go- our lasers.
Finally! Oh my goodness look Timmy. They came with a target.
I'm on it. No look, I'm way more accurate than you.
But wait. I'm on it too. I'm on it right on the bullseye. There's no way.
(Narrator) So they decided to have a competition.
Alright, we have the target all set up and we're both in the same spot. So now you go first.
Okay, watch this.
Okay, well I can do that too. Watch this.
Ha! See I told you I'm better. But I was hitting it, just a second ago.
Yeah, I'm sure you were.
When we were practicing I was hitting the target every time.
Why did I miss?
The only thing that was in my way was this glass bowl.
It's almost like if it bends the light.
Why is that?
(Narrator) Although he didn't understand at the time, Jimmy had just discovered that as light passes through a transparent object it also refracts and bends at different angles.
Light waves change speed when they pass across the boundary between two substances with a different density such as air and glass.
This causes them to change direction, an effect called refraction.
Hey Timmy. What do to that challenge again?
Sure. I'm just going to beat you again.
Alright. We'll see about that. I'll go first.
Well, look at that. Alright.
Ok my turn.
What? Why am I missing?
Yes!
I'm pointing right at it.
I'm the winner!