A certain telescope has an objective mirror with an aperture diameter of 200. mm and a focal length of 2.00x 10 3 mm. It captures the image of a nebula on photographic film at its prime focus with an exposure time of 1.50 min. To produce the same light energy per unit area on the film, what is the required exposure time to photograph the same nebula with a smaller telescope that has an objective with a 60.0-mm diameter and a 900.-mm focal length?

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter2: Geometric Optics And Image Formation
Section: Chapter Questions
Problem 104P: A small telescope has a concave mirror with a 2.00-rn radius of curvature for its objective. Its...
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A certain telescope has an objective mirror with an aperture diameter of 200. mm and a focal length of 2.00x 10 3 mm. It captures the image of a nebula on photographic film at its prime focus with an exposure time of 1.50 min. To produce the same light energy per unit area on the film, what is the required exposure time to photograph the same nebula with a smaller telescope that has an objective with a 60.0-mm diameter and a 900.-mm focal length?

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