The additional lens used in the terrestrial telescope is?

Question: The additional lens used in the terrestrial telescope is?

The additional lens used in a terrestrial telescope is known as the erecting lens. This lens is placed between the objective lens and the eyepiece. Its primary function is to flip the image, which is naturally inverted as it passes through the objective lens, so that it appears upright to the observer. This is particularly useful for terrestrial telescopes that are used to view objects on Earth, as it allows for a correctly oriented image. The erecting lens is a crucial component that differentiates a terrestrial telescope from an astronomical one, which does not typically include this lens since the orientation of celestial objects is not of concern. The inclusion of an erecting lens in terrestrial telescopes makes them ideal for applications such as land surveying, bird watching, or any other activity where an upright image is necessary.

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