What is difference between reflection and refraction?

The direction of light can be changed in 2 ways. One way is refraction which is usually done by a lens (eyeglasses do this). The other is reflection, most often done by a mirror. Telescopes are almost always based on reflection and/or refraction designs. A reflective telescope has at least one curved mirror, often 2 curved mirrors which focus light by reflecting a larger area of natural light on a smaller spot.

http://www.audioenglish.org/dictionary/refraction.htm
Try this link to know more.
http://electronicshelponline.blogspot.com/

check with the service dealer as it may be a legal requirement where you are that you cannot run both lights at the same time . If you can run the main beams then there is no reason to use the fog lights as they serve no useful purpose.. Fog lights a re situated down low and are designed to shine under the fog ( fog is always about 12 " from the ground) and reflect the road markers so that you can see where the road goes and the light is not refracted back as a white sheet in the fog as your main lights do.

physical sunscreens reflect the light off your skin, and chemical sunscreens absorb the UV light

There is the picture

Low or poor signal is mainly caused by the following major factors:

• Obstructions
• Interferences

Going Around Physical Obstructions
Wireless networks are also susceptible to obstructions that may lead to low signal. Often, the signal gets reflected, refracted or absorbed by the obstruction.

Common obstructions are:

• Cabinets
• Mirrors
• Glasses
• Metal objects
• Thick walls and ceilings

If you have any of these objects between your wireless adapter and access point, consider relocating your access point somewhere high to get around the obstruction.

Same principle as a reflex telescope- might Wikipedia Schmidt-cassegrain OR reflex telescope for more info. Long glass lenses need a lot of correction for fact that different wavelengths refract at different angles, while those same beams of light bend the same when reflected.

There are several do it yourself projects on the internet like this one:

http://www.astronomyforum.net/atm-diy-telescope-making-forum/80586-4-diy-refractor.html

and this

http://www.vintageprojects.com/telescope/3-inch.html

However I would suggest that you build a reflecting style telescope like this one. More aperture and lower cost.
http://pages.sbcglobal.net/raycash/manualv2.pdf

OpenGL doesn't handle photonics or any other low-level physics - you'll either need a raytracer, such as POVRAY or Blender, or you'll have to write the physics yourself, to emulate light rays of varying colours (I recommend using a HSL colour space for your physics, only translating to RGB when rendering the frame).
The refraction of a ray at the interface of the prism and the "air" can be calculated using Index of Refraction, correction factor to account for different refraction dependent on frequency (Hue) and a random number generator to emulate slight scattering.

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