Does blue light or orange light have a larger index of refraction?

Blue light is bent more by a prism than orange light. Does blue light or orange light have a larger index of refraction in glass?

A. Blue
B. Orange

If you know the answer to this, could you also explain why? Looking at a picture of the EM spectrum doesn't seem to be helping me much.

2 answers

http://www.rkm.com.au/ANIMATIONS/animation-graphics/prism-dispersing-light.jpg
Blue refracts more