@NASAWebbTelescp It's exciting to know we're another step closer! 
Another #MirrorSeason milestone - #JWST's secondary mirror successfully installed! More: http://go.nasa.gov/1paWZ17 pic.twitter.com/gOEJVgedzN
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@NASAWebbTelescp Why is the secondary mirror convex? Defocus the light? Thought it should converge at instruments.#JWST#MirrorSeason -
@DirkNC Pretty standard Cassegrain design to have concave primary and convex secondary. More: https://en.wikipedia.org/wiki/Cassegrain_reflector … (1/2) - Show replies
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@NASAWebbTelescp Will this secondary mirror have an adaptive optics system? -
@sdwalker4 It does have actuators like the other mirrors, just no curvature adjustment.
End of conversation
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