A Keplerian telescope has a main lens with diameter 10 cm, focal length fo = 90 cm, and an eyepiece of focal length fe = 12 mm. It is then modified by inserting a biconcave lens (called a Barlow lens) of focal length fB = -60 mm, at a location 864 mm to the right of the main lens. The eyepiece is then moved until its front focal point is at the new image, formed by the main lens and the Barlow lens combined. This system observes a globular star cluster of angular diameter 0.1 degrees. Calculate: i) The linear diameter of the real image of the star cluster after the Barlow lens. ii) The angular magnification of the system.
A Keplerian telescope has a main lens with diameter 10 cm, focal length fo = 90 cm, and an eyepiece of focal length fe = 12 mm. It is then modified by inserting a biconcave lens (called a Barlow lens) of focal length fB = -60 mm, at a location 864 mm to the right of the main lens. The eyepiece is then moved until its front focal point is at the new image, formed by the main lens and the Barlow lens combined. This system observes a globular star cluster of angular diameter 0.1 degrees. Calculate: i) The linear diameter of the real image of the star cluster after the Barlow lens. ii) The angular magnification of the system.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter26: Image Formation By Mirrors And Lenses
Section: Chapter Questions
Problem 70P
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