## Optics B/C

Froggie
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### Optics B/C

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.)
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
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Ten086
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### Re: Optics B/C

Uh oh, I haven't done anything optics-related since my school's tryouts last year...
32.1 degrees?
Just trying my best...

Froggie
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### Re: Optics B/C

"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
- Froggie

WhatScience?
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### Re: Optics B/C

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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Thermodynamics, Potions and Poisons, Disease Detectives, Optics, and Towers

Froggie
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### Re: Optics B/C

Someone else can post a question if Ten086 doesn't post in the next 24 hours...
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
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raxu
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### Re: Optics B/C

I'll post one.

A photon has wavelength 500 nm when traveling in crown glass (n=1.52). What is its color?
Richard
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Events done Div. C: Astronomy , It's About Time, Forensics, Optics, Remote Sensing, Game On, Materials Science, Mousetrap Vehicle, Fermi Questions, Thermodynamics.

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### Re: Optics B/C

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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Ten086
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### Re: Optics B/C

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...

Froggie
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### Re: Optics B/C

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.
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
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Unome
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### Re: Optics B/C

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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Froggie
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### Re: Optics B/C

We should start this back up...
Anyone want to ask a question?
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
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Pettywap
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### Re: Optics B/C

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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ClaireAndreasen
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### Re: Optics B/C

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

Pettywap
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### Re: Optics B/C

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
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.
"Who's Fettywap?"

Tom_MS
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### Re: Optics B/C

Hey I have a question:
Suppose the density of air in the atmosphere can be approximated by $log(d)=-3h/50$ 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?