The focal length of the objective lens of a telescope is 30 cm and that of its eye lens is 3 cm. It is focussed on a scale 2 metres distant from it. The distance of the objective lens from the eye lens to see with relaxed eye is :-

Options

A. 33 cm
B. 65.3 cm
C. 38.3 cm
D. 40.3 cm

Answer

C

Explanation

Here `mu_0`=-200 cm , f=30 cm
or
Now, `L=v_0+f_e` =35.3+3 =38.3 cm