NDA 2019 Physics question

The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eye-piece is

(A)12·5 cm
(B)5 cm
(C)2 cmCorrect
(D)10 cm

Answer: (C)

Solution

For a telescope in normal adjustment, magnification . Hence cm.

Question ID VK-031340