A stargazer has an astronomical telescope with an objectivewhose focal length is

Question

A stargazer has an astronomical telescope with an objectivewhose focal length is 180cm and an eyepiece whose focal length is1.20cm. He wants to increase the angular magnification of a galaxyunder view by replacing the telescope's eyepiece. Once the eyepieceis replaced, the barrel of the telescope must be adjusted to brin gthe galaxy back into focus. If the barrel can only be shortened by0.50cm from its current length, what is the best angularmagnification the stargazer will be able to achieve? Please Help...I'm not sure where to start. A stargazer has an astronomical telescope with an objectivewhose focal length is 180cm and an eyepiece whose focal length is1.20cm. He wants to increase the angular magnification of a galaxyunder view by replacing the telescope's eyepiece. Once the eyepieceis replaced, the barrel of the telescope must be adjusted to brin gthe galaxy back into focus. If the barrel can only be shortened by0.50cm from its current length, what is the best angularmagnification the stargazer will be able to achieve? Please Help...I'm not sure where to start.

Explanation / Answer

M = - {fo/(fe1-L) = - {180/(1.2-0.5) = - 257.1

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