Terrestrial Telescope
The image in an astronomical telescope is inverted and hence it is suitable in astronomy because it makes little difference for viewing the stars. But, an astronomical telescope appears to be useless for viewing objects on the surface of the earth in which case an erect image is a necessity. Therefore, a terrestrial telescope is used which provides an erect image.
It contains an objective, eyepiece and an erecting lens L of focal length ƒ1. The objective forms an inverted image AB of a distant object. The lens L is at a distance 2ƒ1 from AB and thus forms the erect image A’B’ at A’. The image A’B’ is formed at the forms of the eyepiece. Therefore the final image is formed at infinity and it is erect.
The length of the terrestrial telescope is equal to (F + ƒ + 4ƒ1) and the angular magnification is F/ƒ.
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