# Answer to Question #8711 in Optics for Mariam Farhat

Question #8711

2. Refracting telescope

The lenses in a refracting telescope are seperated by 65 cm. If the final image is at infinity and has an angular magnification of 25X. find the focal lengths of the lenses.

the equation when the final image is at infinily is: angular magnification = - focal length of the objective/ focal

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