WEBVTT

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[Narrator] A common misconception is that as light travels through a transparent object it is unaffected.

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However, this is not true. To demonstrate this we will go to a story of two brothers

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who discover that light is affected as it travels through transparent objects and you should never presume what you don't know.

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Hey Jimmy. Wanna watch Space Blaster? No, let's
watch Power Boy instead. It's way better.

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Why would we want to watch Power Boy when we could watch the greatest show ever?

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Because it's on right now.

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[door bell rings]

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It that our lasers? I think
it is.

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I think it is!

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I have a package for Timmy and Jimmy Johnson.

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That's us. A package for me. Let's go-
our lasers.

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Finally! Oh my goodness look Timmy. They came with a target.

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I'm on it. No look, I'm
way more accurate than you.

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But wait. I'm on it too. I'm on it right on the bullseye. There's no way.

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(Narrator) So
they decided to have a competition.

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Alright, we have the target all set up and we're both
in the same spot. So now you go first.

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Okay, watch this.

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Okay, well I can do that too. Watch
this.

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Ha! See I told you I'm better. But I was hitting it, just a second ago.

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Yeah, I'm sure you were.

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When we were practicing I was hitting the target every time.

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Why did I miss?

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The only thing that was in my way was this glass bowl.

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It's almost like if it bends the light.

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Why is that?

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(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.

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Light waves change speed when they pass across the boundary between two substances with a different density such as air and glass.

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This causes them to change direction, an effect called refraction.

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  Hey Timmy. What do to that challenge again?

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Sure. I'm just going to beat you again.

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Alright. We'll see about that. I'll go first.

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Well, look at that. Alright.

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Ok my turn.

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What? Why am I missing?

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Yes!

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I'm pointing right at it.

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I'm the winner!