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In a telescope, the magnification is 5 and the distance between the objective and eyepiece is 24 cm. What are the focal lengths of the objective and eyepiece lenses?

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In a telescope, the magnification is 5 and the distance between the objective and eyepiece is 24 cm. What are the focal lengths of the objective and eyepiece lenses? Answer: 20 cm and 4 cm

Using 𝑀 = 𝑓𝑜/𝑓𝑒 and 𝑓𝑜 + 𝑓𝑒 = 24 we get 𝑓𝑜 = 20 cm and 𝑓𝑒 = 4 cm.

Question context

This question is part of ⚙️ Mechanical Eng within the broader 🛠️ Engineering Essentials subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.