Optics B/C

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Optics B/C

Postby Froggie » September 10th, 2017, 7:22 am

I just realized this wasn't a thing..
So here goes.
Start simple (kind of):
The first medium is air and the second is water. The angle of incidence is 45 degrees. What is the angle of refraction?

(I hope I worded this correctly enough.)
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Re: Optics B/C

Postby Ten086 » September 23rd, 2017, 1:10 pm

Uh oh, I haven't done anything optics-related since my school's tryouts last year...

32.1 degrees?
Just trying my best...

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Re: Optics B/C

Postby Froggie » September 23rd, 2017, 1:52 pm

Correct! Your turn. :)
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Re: Optics B/C

Postby WhatScience? » September 26th, 2017, 6:04 pm

Ten086 wrote:Uh oh, I haven't done anything optics-related since my school's tryouts last year...

32.1 degrees?


Just quoting you to give you a notification and remind you that this thread does indeed exist.
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Re: Optics B/C

Postby Froggie » October 1st, 2017, 11:32 am

Someone else can post a question if Ten086 doesn't post in the next 24 hours...
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Re: Optics B/C

Postby raxu » October 8th, 2017, 9:10 am

I'll post one.

A photon has wavelength 500 nm when traveling in crown glass (n=1.52). What is its color?
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Re: Optics B/C

Postby Adi1008 » October 8th, 2017, 2:31 pm

raxu wrote:I'll post one.

A photon has wavelength 500 nm when traveling in crown glass (n=1.52). What is its color?

Answer

Red or near infrared, depending on which boundaries are used
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Re: Optics B/C

Postby Ten086 » October 16th, 2017, 6:39 pm

Oh jeez sorry, completely forgot that I replied in here :( Sorry, first time doing anything in a question marathon. This forum sure is dead though, is it just early in the year or are question marathons not very active?
Just trying my best...

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Re: Optics B/C

Postby Froggie » October 17th, 2017, 12:57 pm

raxu wrote:I'll post one.

A photon has wavelength 500 nm when traveling in crown glass (n=1.52). What is its color?

Doing what WhatScience? did.
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Re: Optics B/C

Postby Unome » October 17th, 2017, 2:13 pm

Ten086 wrote:Oh jeez sorry, completely forgot that I replied in here :( Sorry, first time doing anything in a question marathon. This forum sure is dead though, is it just early in the year or are question marathons not very active?

In general, the physics events have not historically had very active question marathons. The main exceptions are Simple Machines 2015 and Optics last year, though neither were particularly long. Typically, all it takes is a few active people to keep a question marathon active - which is what happened in Simple Machines, a lot of it was mjcox2000 and I going back and forth with higher-level problems (well, higher-level for Div B).
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Re: Optics B/C

Postby Froggie » January 3rd, 2018, 5:55 am

We should start this back up...
Anyone want to ask a question?
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Re: Optics B/C

Postby Pettywap » January 3rd, 2018, 1:46 pm

Can anyone draw a real diagram for this?
"Two thin converging lenses each with a focal length of 40 cm are positioned with 40 cm apart. An object is placed 60cm to the left of the first lens."
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Re: Optics B/C

Postby ClaireAndreasen » January 5th, 2018, 7:26 am

Pettywap wrote:Can anyone draw a real diagram for this?
"Two thin converging lenses each with a focal length of 40 cm are positioned with 40 cm apart. An object is placed 60cm to the left of the first lens."


I probably didn't draw this right (and I don't know how to attach an image to this post), but tell me if this link works
https://drive.google.com/file/d/0B24fq_ ... sp=sharing

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Re: Optics B/C

Postby Pettywap » January 5th, 2018, 7:32 am

ClaireAndreasen wrote:
Pettywap wrote:Can anyone draw a real diagram for this?
"Two thin converging lenses each with a focal length of 40 cm are positioned with 40 cm apart. An object is placed 60cm to the left of the first lens."


I probably didn't draw this right (and I don't know how to attach an image to this post), but tell me if this link works
https://drive.google.com/file/d/0B24fq_ ... sp=sharing

ngl I don't really know either but I thought that the very first line you drew was correct. I asked this question because I don't really know all of the rays.
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Re: Optics B/C

Postby Tom_MS » February 5th, 2018, 6:52 pm

Hey I have a question:
Suppose the density of air in the atmosphere can be approximated by where d is density in kg/m^3 and h is altitude above sea level in km. The optical depth of a column of air at some location 15 km above sea level is taken to be 1.00. Find the opacity of that column of air in m^2/kg (assume opacity is constant).

And follow up question: If the sun shines with intensity 1.300 kw/m^2 at that same location 10 km above sea level, what will its intensity be when it reaches sea level?


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