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A Galilean telescope is 18 cm long when focused to form an image at infinity. If the objective lens has a focal length of 20 cm, what is the focal length of the eyepiece? |
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Answer» A Galilean telescope is 18 cm long when focused to form an image at infinity. If the objective lens has a focal length of 20 cm, what is the focal length of the eyepiece? |
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