An astronomical telescope has an angular magnification of magnitude 5 for distant objects

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. Find the focal length f0f_0 of the objective and the focal length fef_e of the eyepiece. (1) f0=45f_0 = 45 cm and fe=−9f_e = -9 cm (2) f0=50f_0 = 50 cm and fe=10f_e = 10 cm (3) f0=7.2f_0 = 7.2 cm and fe=5f_e = 5 cm (4) f0=30f_0 = 30 cm and fe=6f_e = 6 cm.

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