Primary rainbows consist of a single bright arc of color.
    The are the most commonly seen rainbows
    Primary rainbows are at an angle of about 42 degrees.
 
 

http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/wtr/rnbw/prm.rxml

    Secondary rainbows are fainter, and compliment the primary rainbow.
    Secondary rainbows are at an angle of about 50 degrees.
 

                                   
http://ffden-2.phys.uaf.edu/211.web.stuff/Croy_Filla/Page_6.html                                                http://members.tripod.com/~EmpressEmpress/rainbow_types.html