A simple eye has one lens. This site explains and has pictures of compound eyes.
http://bugguide.net/node/view/111909
What are compound and simple eyes?
2 answers
I searched Google under the key words "compound simple eyes" to get these possible sources:
http://en.wikipedia.org/wiki/Compound_eye
http://library.thinkquest.org/28030/eyeevo.htm
http://www.cals.ncsu.edu/course/ent425/tutorial/photo.html
http://www.britannica.com/eb/topic-130201/compound-eye
http://books.google.com/books?id=m_o4AAAAMAAJ&pg=PA23&lpg=PA23&dq=compound+simple+eyes&source=web&ots=JYsuysyklf&sig=2MrIxJyYXHbL2lT-GkicI36-Ljs#PPA22,M1
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
http://en.wikipedia.org/wiki/Compound_eye
http://library.thinkquest.org/28030/eyeevo.htm
http://www.cals.ncsu.edu/course/ent425/tutorial/photo.html
http://www.britannica.com/eb/topic-130201/compound-eye
http://books.google.com/books?id=m_o4AAAAMAAJ&pg=PA23&lpg=PA23&dq=compound+simple+eyes&source=web&ots=JYsuysyklf&sig=2MrIxJyYXHbL2lT-GkicI36-Ljs#PPA22,M1
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.