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In which of the following a sub-reflector called trans-reflector is present?

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In which of the following a sub-reflector called trans-reflector is present?

(a) Polarization-twist reflector

(b) Plane reflector

(c) Cassegrain

(d) Gregorian
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The correct option is (a) Polarization-twist reflector

Best explanation: It is present in Polarization-twist reflector. Sub-reflector consists of a horizontal grating of wires. Cassegrain contains a hyperboloid sub-reflector. Gregorian contains an ellipsoidal sub-reflector.
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