At one point I did introduce the confusion. I suggested using a flat mirror and a focusing lens to emulate a parabolic dish mirror. This could be used to use a magnifying glass to light the underside of something, but was mainly to show what a dish mirror could do if you did not habve one handy for experimentation. It may have been understood to mean adding the dish mirror plus a magnifying lens.

Frankly I did not think of the fresnel pluss mirror combination. A fresnel lens may not work at all with the light going through it twice because the second pass would involve angles way out of specs towards the edges. It would probably cause great inefficiency or loss of light. Dimming.

The only way I see it working anywhere near well with a fresnel lens is if the light was reflected and the lens placed in the reflected beam, out of the way of shadowing the incoming light. If you are using a dish mirror, the focal length may be too short to have the fresnel lens out of the incoming light and still focusing a considerable amount of the reflected light.