Question

All of the following statements are correct except

• A. The total length of an astronomical telscope is the sum of the focal lengths of its two lenses
• B. The image formed by the astronomical telescope is always erect because the effect of combination of the two lenses is divergent
• C. The magnification of an astronomical telescope can be increased by decreasing the focal length of the eye- piece
• D. The magnifying power of the refracting type of astronomical telescope is the ratio of the focal length of the objective to that of the eye-piece

Answer 1

The correct option is B The image formed by the astronomical telescope is always erect because the effect of combination of the two lenses is divergent

Final image formed by astronomical telescope is inverted not erect.