The most challenging aspect in constructing a telescope with large light
gathering power and a capability of achieving high angular resolution is the
primary mirror. In this chapter we discuss various aspects of building and testing
mirrors, especially large concave mirrors, and the effects of residual errors on
image quality, including errors that arise in the support of such mirrors. We also
consider telescopes used in concert to achieve angular resolution beyond that
possible with a single telescope.
18.1.
LARGE MIRRORS
The history of large mirrors is closely linked to the technologies of castin ...
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