Four lenses of focal length + 10 cm, + 50 cm, + 100 cm and + 200 cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eyepiece should be
A. + 10 cm
B. + 50 cm
C. + 100 cm
D. + 200 cm
Answer:A
Four lenses of focal length + 10 cm, + 50 cm, + 100 cm and + 200 cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eyepiece should be
A. + 10 cm B. + 50 cm C. + 100 cm D. + 200 cm