What is the essential difference between a terrestrial telescope

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What is the essential difference between a terrestrial telescope and an astronomical telescope ?

1. One of the lenses in a terrestrial telescope is concave
2. The final image formed in a terrestrial telescope is virtual
3. A terrestrial telescope forms an erect image while an astronomical telescope forms an inverted image
4. A terrestrial telescope forms an inverted image while an astronomical telescope forms an erect image

Correct Option: C

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