Physics/light
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Question
What is real and virtual image? And tell me about diffraction, interference and polarisation please.
I'll explain part of this and then refer you to hyperphysics because you don't have a specific question. If you're drawing a ray diagram to figure out where an image is formed and light passes through the actual image location, the image is something which could be focused on a screen and it is real. If you have to extend the rays of light and light doesn't pass focus at the location where the image is formed, the image cannot be focused on a physical projection screen and it is virtual. For the rest of your question, this really isn't the proper forum to teach you a class on physics. Go do some research here: http://hyperphysics.phy-astr.gsu.edu/Hbase/ligcon.html It has a nice graphical index of all the concepts you're looking for, with formulae and detailed descriptions and all that jazz. It's maintained by a reputable university (GSU) and its home index for the rest of basic physics is here:
http://hyperphysics.phy-astr.gsu.edu/hbase/HFrame.html
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Answers by Expert:
Steve Nelson
Expertise
I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.
Experience
I'm a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. I teach physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science.
Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.
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