Physics Help Please --- Telescope

An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm.

a) What is the total length of the telescope?

b) What is the angular magnification of the telescope?

c) What is the magnification by turning the telescope around and looking through the objective lens first?

Please Show Works!!!

Thank you!

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  1. a) fe+fo

    114 cm + 17 cm = 131 cm

    b) M=fo/fe

    114 cm / 17 cm = 6.71 cm

    c) Need help with this part.

    Thank you!

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    2. 👎
  2. b.
    Magnification is a pure number (no units)
    When turned around, fe=17, fo=114

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