A good refracting telescope must use more than one glass lens element to form a real image because
A. it takes two lens elements to form a real image: one to converge the rays and one to stop the convergence right at the focus.
B. the magnification obtainable with a single element telescope is so small as to be essentially useless.
C. dispersion in a single element telescope will cause different colored lights from the same object to focus at different locations.
D. a single lens element can only form a virtual image and it takes a second lens element to turn that virtual image into a real image.
Answer:C
A good refracting telescope must use more than one glass lens element to form a real image because
A. it takes two lens elements to form a real image: one to converge the rays and one to stop the convergence right at the focus. B. the magnification obtainable with a single element telescope is so small as to be essentially useless. C. dispersion in a single element telescope will cause different colored lights from the same object to focus at different locations. D. a single lens element can only form a virtual image and it takes a second lens element to turn that virtual image into a real image.