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the mirror of the reflecting telescope has a 2.4 m radius of curvature and the eyepiece has a focal length of 20mm. The telescope is used to view a crater of the moon. the final image is viewed at inifinity. The angle subtended by the final image of the crater is 12 mrad. The distance of the moon from the earth is 380,000 km.

A) The diameter of the crater in km is closest to?

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