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How does light from the cosmos reach Webb's instruments?

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the secondary mirror

3
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out of the dozens of deployments, this is the one of the last to complete.

4
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struts unfold to place the secondary mirror almost 24 feet from the Primary Mirror.

5
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Struts unfold to place the secondary mirror almost 24 feet from the Primary Mirror.

6
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Engineers offload the weight of the secondary mirror and struts so they deploy as if it was weightless.

7
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The spacecraft bus, while not yet physically attached, commands the move electronically.

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The next milestone: Joining the Telescope Element and Spacecraft Element