Question

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I. The magnification of the telescope is

(a) L+I/L-I

(b) L/I

(c) L/I+1

(d) L/I-1

Answer 1

The magnification of the telescope is L/I.