explain the priniciples of light thaat enable the convex lens to function as it does
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
Since this is not my area of expertise, I searched Google under the key words "principles of light convex lens" to get these possible sources:
http://www.google.com/search?client=safari&rls=en&q=principles+of+light++convex+lens&ie=UTF-8&oe=UTF-8
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/.