1.

Which of the following uses lens and mirrors for focusing?(a) Refractive(b) Reflecting(c) Catadioptric(d) Orthogonal

Answer» 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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