It is currently Sun Mar 29, 2020 9:16 pm


Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Sun Dec 08, 2019 6:36 pm 
Offline

Joined: Sun May 11, 2008 6:11 pm
Posts: 3303
Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
8th December 2019; 1450 UT; Windy and cloudy in the afternoon but a rather limited gap in the cloud-cover revealed a surprising but very quick view of VENUS in daylight, using L/S 60mm spotter from the garden...but was very soon clouded-out. [obs.#584] -------leading to very heavy cloud, part of which broke to reveal the Sun fairly low down and a torrential shower produced superb, spectacularly coloured rainbow--- both primary and secondary bows seen and photographed. regards maf.


Top
 Profile Send private message  
 
PostPosted: Sun Dec 08, 2019 9:44 pm 
Offline

Joined: Fri Dec 10, 2004 10:34 pm
Posts: 369
Location: Surrey
One interesting thing to do with a rainbow is to image it / view it through a polarising filter. At certain angles the rainbow dissapears completely showing the light is polarised. I am nor sure if the polarisation is the same all round the arc as the images I have where I experimented with a polarising filter show only part of the arc and then show it missing with the filter rotated.

At the time I was a bit confused about what my polarising filter does as it is a circularly polarised filter designed for digital cameras. I thought that it only let left or right handed circular polarised light through but I have since realised that assumption is an error. These filters consist of a linear polariser (on the outside) followed by a circular polariser nearest the lens. They are made like this as linear polarised light confuses the sensor on the camera. They are quite interesting as they are directional - you get a different effect if you look through them the other way.

_________________
Engineer @ Work - Astronomer @ Play


Top
 Profile Send private message  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group