NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
April 20, 2021, 01:33:20 pm *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
   Home   Help Search Login Register  
"Nothing in life is to be feared, it is only to be understood." ..."Marie Curie 1867-1934, Polish born French Physicist, Twice Nobel Prize Winner- Physics and Chemistry)"
Google Bookmarks Yahoo My Web MSN Live Netscape Del.icio.us FURL Stumble Upon Delirious Ask FaceBook

Pages: [1]   Go Down
Author Topic: Manufactured Rainbow  (Read 18566 times)
0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Offline Offline

Posts: 1

Embed this message
on: February 17, 2006, 11:46:50 pm »

Hi, bear with me. This is a long winded question

I'm aspiring scriptwriter currently in dilema concerning one of my scenes.

I have a character who has to see a rainbow at a certain time in order to
initiate an exchange of dialogue concerning the various myths and legends
of Rainbows. Problem is he has to know that the rainbow was going to be there,
therefore it can't be a freak random occurence of the weather.

I've described a fountain, the centre courtyard piece between a triangle of
towering glass buildings (this fountain doesn't exist. It's purely fictional).
During my research I read that rainbows can occur anywhere where cascading
rain droplets intersect sunlight at the correct angle and the relation to where the observer sees it from.

So my question is can a structure (ie.fountain) be created, using
specifically angled mirrors, that, providing the sun is shining, can create a
rainbow at a specific time of the day, depending on the sun's location.

I want to have a scene where a seat is positioned in front of the fountain
and that every day, At the same time on the dot, providing there's sun shine,
a feint rainbow is can be seen from that seat.

Not being exactly blessed in the knowledge of the physics of science I have no idea
if the season/time of the year effects this in any way.

Another question I have is does it matter if it's a spray or cascading
waterfall fountain? Would that effect the intensity of the rainbow?

Any help would be greatly appreciated.
Fu-Kwun Hwang
Hero Member
Offline Offline

Posts: 3086

Embed this message
Reply #1 on: February 20, 2006, 10:52:58 am »

As you can see from the physics of rainbow applet.
If the sun ray is coming horizontally(near sunrise or sunset), you will see rainbow at about 40-42 degree.
If it is one hour earlier than sunset or one hour later than sunrise:
 The angle of sun ray will be 360/24=15 degree, so the rainbow will be observed at 55-57 degree.
So you would not be able to see rainow from the sun ray if it is 3 hours before sunset or 3 hours after sunrise. (unless you are located at a high place -e.g. on top of a mountain , and looking down).
Pages: [1]   Go Up
"Nothing in life is to be feared, it is only to be understood." ..."Marie Curie 1867-1934, Polish born French Physicist, Twice Nobel Prize Winner- Physics and Chemistry)"
Jump to:  

Related Topics
Subject Started by Replies Views Last post
physics of Rainbow « 1 2 »
Fu-Kwun Hwang 40 602804 Last post February 06, 2020, 08:47:21 am
by adamschule85
Physics of rainbow (EJS version)
Fu-Kwun Hwang 0 12766 Last post February 12, 2010, 06:23:04 pm
by Fu-Kwun Hwang
Physics of rainbow (EJS version)
ahmedelshfie 5 12602 Last post February 16, 2020, 10:33:11 pm
by visasoulii9
Physics of rainbow (EJS version)
Questions related to EJS
ahmedelshfie 4 9828 Last post May 12, 2010, 11:30:28 pm
by ahmedelshfie
Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 0.109 seconds with 22 queries.since 2011/06/15