# Question: A terrestrial telescope has three lenses an objective an erecting

A terrestrial telescope has three lenses: an objective, an erecting lens, and an eyepiece.

(a) Does the erecting lens (1) increase the magnification, (2) increase the physical length of the telescope, (3) decrease the magnification, or (4) decrease the physical length of the telescope? Explain.

(b) This terrestrial telescope has focal lengths of 40 cm, 10 cm, and 5.0 cm for the objective, erecting lens, and eyepiece, respectively. What is the magnification of the telescope for an object at infinity?

(c) What is the length of the telescope barrel?

(a) Does the erecting lens (1) increase the magnification, (2) increase the physical length of the telescope, (3) decrease the magnification, or (4) decrease the physical length of the telescope? Explain.

(b) This terrestrial telescope has focal lengths of 40 cm, 10 cm, and 5.0 cm for the objective, erecting lens, and eyepiece, respectively. What is the magnification of the telescope for an object at infinity?

(c) What is the length of the telescope barrel?

## Relevant Questions

A terrestrial telescope uses an objective and eyepiece with focal lengths of 42 cm and 6.0 cm, respectively. (a) What should the focal length of the erecting lens be if the overall length of the telescope is to be 1.0 m? ...What is the resolution limit due to diffraction for the European Southern Observatory reflecting telescope-50* (which has an 8.20-m, or 323-in., diameter) for light with a wavelength of 550 nm? If a camera with a 50-mm lens is to resolve two objects that are 4.0 mm from each other and both objects are 3.5 m from the camera lens, (a) What is the minimum diameter of the camera lens? (b) What is the resolving power? ...Referring to Fig. 25.25, show that the angular magnification of a refracting telescope focused for the final image at infinity is m = – fo/fe. (Because telescopes are designed for viewing distant objects, the angular size ...You are standing on the Earth and observe a spacecraft speeding by with your professor on board. (a) If both you and your professor are observing your wristwatch, who is measuring the proper time? (b) Who measures the ...Post your question