Question

Compare the size of the visible light spectrum with the size of the elctromagnectic spectrum?

Answer 1

Visible light is a very small part of the electromagnetic spectrum.

Since this is not my area of expertise, I searched Google under the key words "elctromagnetic spectrum vision" to get these possible sources:

http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/light/u12l2a.html
http://library.thinkquest.org/26111/spectrum.html
http://faculty.washington.edu/chudler/bigeye.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.