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What is the image of the star at the focal plane called as?

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What is the image of the star at the focal plane called as?

(a) Star fixed image

(b) Celestial interference image

(c) Diffraction limited image

(d) Spot image

The question was asked in final exam.

This interesting question is from Stellar Sensor Design in section Celestial Navigation, Doppler and Altimeter Radars of Avionics

1 Answer

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Correct answer is (c) Diffraction limited image

For explanation: The image of a star at the focal plane of the telescope with perfect, unobstructed optics is a bright spot surrounded by a series of concentric dark and light rings. This image is called a diffraction limited image.

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