In a terrestrial telescope, the focal length of objective is `90cm`, of inverting lens is `5 cm
Channel: Doubtnut
Date: 2020-01-19

In a terrestrial telescope, the focal length of objective is `90cm`, of inverting lens is `5 cm` and of eye lens is `6 cm`. If the final image is at `30cm`, then the magnification will be the final image is at `30cm, ` then the magnification will be