Physics halp! (1 Viewer)

[ohexploitable]

Beams of yellow light and green light are incident onto a rectangular glass slab at 60°. The angles of refraction for these beams are measured at 34° (green) and 32° (yellow). State which colour travels faster in glass. Justify your answer.

I'm confuddled

 

[ohexploitable]

Oh wait... dw... lol... roffle... I get it...

 

[hscishard]

It better be green.

For the justify part..would you use that snells law?
I'd just say because its a larger angle, it must be quicker.

 

[ohexploitable]

It better be green.

For the justify part..would you use that snells law?
I'd just say because its a larger angle, it must be quicker.

Nar, it's yellow cos yellow has a lower refractive index.

 

[ohexploitable]

Higher refractive index means lower velocity.

 

[hscishard]

Nar, it's yellow cos yellow has a lower refractive index.

Wahh? So lower is faster?

 

[ohexploitable]

Wahh? So lower is faster?

Yar, like a vacuum has a lower refractive index than diamond, so light travels faster in a vacuum than in diamond.

 

[hscishard]

This doesn't make sense. Isn't refractive index for materials(mediums)?

 

[hscishard]

Yar, like a vacuum has a lower refractive index than diamond, so light travels faster in a vacuum than in diamond.

But we're only dealing with one medium. Glass.

 

[ohexploitable]

2 mediums, air (I assume) and glass.

 

[ohexploitable]

There's no answers

 

[hscishard]

The question is asking which colour is faster but

 

[hscishard]

What book do you use?

 

[ohexploitable]

They're just sheets the teacher gave us.

 

[hscishard]

Did it give the velocity of green and yellow light by any chance?

 

[ohexploitable]

Nope.

 

[hscishard]

Snell's law is useless in this question. Lol

 

[ohexploitable]

Think of it this way, the greater the refractive index, the greater the change in velocity.

You can work out the refractive indexes (indices?) at the boundary for both.

n_yellow < n_green

n_green is greater so green undergoes a greater change in velocity. So yellow is fasterer.

 

[hscishard]

Oh shit. I meant yellow then.
I was thinking more away from the normal. Forgot it was measured from the boundary.

God I'm clumsy.

 

[ohexploitable]

Umm... it is measured from the normal...