Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows
A) chromatic aberration to be reduced.
B) X- rays to be focused.
C) more light to be gathered.
D) greater magnification.
E) effects of atmospheric turbulence to be reduced.

Question

Quizplus · Accepted Answer

Adding a secondary concave lens of a different type of glass to the primary lens in a refractor telescope helps in reducing chromatic aberration. This is because different wavelengths of light are refracted by different amounts when passing through a lens, and using a secondary lens can help correct this dispersion, leading to clearer images.

Adding a Secondary Concave Lens of Carefully Chosen Different Glass