A telescope can be used as a camera if the film is placed, Ask an Expert

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A telescope can be used as a camera if the film is placed at the image position of the objective lens (or mirror); so the objective lens becomes the lens of the camera. If a 2.00 m focal length objective lens of a telescope is used to photograph the image of two stars that are 20.0 mm apart on the film, what is the angular separation of the two stars?

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