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An astronomical telescope has an objective of focal length 100 cm and…
Question
An astronomical telescope has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. The instrument is adjusted so that the final image is formed at the near point of the eye (25 cm). Find the magnitude of its angular magnification.
✓ Verified answer: 24checked by our engine — not a guess
Step-by-step solution
For final image at the near point, M = (fo/fe)*(1 + fe/D). M = (100/5)*(1 + 5/25) = 20*(1 + 0.2) = 20*1.2 = 24. Final answer: 24
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