I suggest you find yourself a decent geology textbook, or resources on the web, coupled with a bit on the sun/how light travels. Then compare it with everything you can find on this site, and then go with whatever you think is right.
I am a firm RE'er, by the way, but I applaud you for challenging what you have been told. Personally, I looked here, and wasn't convinced in the slightest. I've not seen suitable explanations for too many key things to accept FE (I won't list anything, it's all been posted many times before, and I don't want to derail this thread).