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I was planning of making a telescope like JWST, just with plain mirrors, as bigger concave or convex are much expensive. The primary mirror would be totally made of plain mirrors configured like JWST. I'm having doubt regarding secondary mirror: can i use plain there?

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    $\begingroup$ A plain secondary mirror serves no optical purpose other than changing the direction of the light. That alone means you hence will not build a telescope like the JWST, but a segmented Newtonian telescope. Probably you rather build a kaleidoscope than a telescope that way with only flat mirrors $\endgroup$ Jan 13 at 10:22
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    $\begingroup$ Sounds like an interesting project especially for education. But JWST doesn't have primary mirror from flat segments. $\endgroup$
    – Leos Ondra
    Jan 13 at 10:27
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    $\begingroup$ @LeosOndra are you talking about those 18 segments, and they aren't flat???? $\endgroup$ Jan 13 at 10:46
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    $\begingroup$ @planetmaker I am not intended to make a telescope like JWST .If it would work , i am ready to make a newtonian. $\endgroup$ Jan 13 at 10:55
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    $\begingroup$ Oh ,actually when i searched this on google it shows that the mirror segment is 1.3 meters FLAT TO FLAT i thought they are talking about the curve , but i think they were showing the flat to flat length of the segment $\endgroup$ Jan 13 at 11:57

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