Q: There seems to be two ways to understand the mechanism of chidābhāsa:

1. Light (brahman) is reflected off the mind and illuminates objects so they can be seen and experienced.

2. Light reflects off objects and is refracted through the prism of the mind.

I’m guessing that 1 is preferred, because 2 assumes that there are objects for the light (brahman) to reflect off, whereas 1 implies that the objects are only ‘there’ because of the mind?

A: Each of the ‘explanations’ in Advaita is really just to move you a bit closer to the realization that there is only Brahman (and, consequently, you are That). You shouldn’t attempt to ‘join’ them together and try to make one ‘explanation’ ‘explain’ another.

As far as the ‘mechanism’ of perception is concerned, you certainly should not attempt to join an Advaita understanding with a scientific one! According to Advaita, Consciousness itself forms a vRRitti at the location of the object instantaneously (since Consciousness is everywhere). The speed of light, normally considered an inviolable restriction regarding visual perception, just isn’t relevant. Read Chittaranjan Naik’s book ‘Natural Realism and Contact Theory of Perception: Indian Philosophy’s Challenge to Contemporary Paradigms of Knowledge’ if you are interested. (I wrote a review of it at Amazon also.) Buy from Amazon US ; Buy from Amazon UK

Shankara does reference vācārambhaṇa shruti from Chandogya regarding our imposing name and form on Brahman but he also talks about Ishvara creating the universe. You really need to be aware of both and use whichever is appropriate! It is certainly true to say that, without the mind, you would not be aware of anything!