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Which of the following uses lens and mirrors for focusing?

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Which of the following uses lens and mirrors for focusing?

(a) Refractive

(b) Reflecting

(c) Catadioptric

(d) Orthogonal

The question was posed to me by my school principal while I was bunking the class.

My doubt stems from Stellar Sensor Design in division Celestial Navigation, Doppler and Altimeter Radars of Avionics

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Correct answer is (c) Catadioptric

Explanation: Telescopes are of three types: refractive, which uses lenses as their primary focusing elements, reflective, which uses a curved mirror for focusing, and catadioptric, which mix mirror and lens systems.

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