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Why doesn't the secondary mirror of a Newtonian reflector leave a hole in the middle of the image?
Wiki User
∙ 12y ago
Great question!
It's because the obstruction is in the optical space where all the rays are parallel. This is a bit hard to grasp at first. But if you trace the rays from an object that is near infinity (optically) you will see that the presence of an object that intercepts some rays only reduces the total number of rays gathered.
Wiki User
∙ 12y ago
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