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I'm trying to make a pinball game but I'm having difficulty working out how to calculate how the ball should 'bounce' when it collides with an object.

I'm encountering problems when the object the ball's colliding with has sides which are at different angles (so an object would have vertical and horizontal sides and possibly diagonal ones as well). This isn't explained very well so have a look at the top of the picture I've attached.

To make it really clear the picture also shows what would happen if the vertical side of the object was hit and another showing what would happen if the sloped side was hit.

So I'm really wondering if there any is any way to work out the angle of the side the ball has hit and from there work out how the ball should bounce off.

P.S.
In my game I have hidden the white area surrounding the bumper so the ball sprite doesn't interact with it.

Check out http://forum.thegamecreators.com/?m=forum_view&t=126064&b=5, it may have what you need.