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Q150
(NDA-I/2023)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
Which one of the following telescopes contains only mirrors ?
Result
Your answer:
—
·
Correct:
C
Explanation
The Newtonian telescope is the correct answer as it is a classic type of reflecting telescope. It was designed by Sir Isaac Newton to eliminate chromatic aberration common in lens-based telescopes. Its primary optical system consists of a concave parabolic primary mirror and a flat diagonal secondary mirror to direct light to the side of the tube.
- Galilean and Keplerian telescopes: These are refracting telescopes that use only lenses (convex and concave) to gather and focus light.
- Schmidt telescope: This is a catadioptric telescope, meaning it uses a combination of mirrors and lenses (specifically a spherical primary mirror and a thin aspherical corrector lens).
- Newtonian telescope: While an eyepiece (lens) is used for viewing, the main light-gathering and focusing mechanism relies entirely on mirrors, distinguishing it from the refracting and catadioptric designs listed.
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