For normal adjustment, length of astronomical telescope is:
Correct answer: A. f₀ + fₑ
- A. f₀ + fₑ
- B. f₀ - fₑ:
- C. f₀/ fₑ:
- D. fₑ/f₀:
Explanation
Explanation: For normal adjustment of an astronomical telescope, the final image is formed at infinity. The relationship for the length of the telescope (L) is given by L=f0 +fe , where f0 is the focal length of the objective lens and fe is the focal length of the eyepiece.
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