Question

The refracting telescope at the Yerkes Observatory has a 1.00-m diameter objective lens of focal length 20.0 m. Assume it is used with an eyepiece of focal length 1.90 cm. (a) Determine the magnification of Mars as seen through this telescope.

Answer 1

angular magnifiction=
`m= ( f_(0) )/( f_(e) )`

`f_(0)=`=focal length of object lens=20m

`f_(e)=`focal length of eye lens=1.90 m
so magnification=m=20/1.9=?

Answer 2

Magnification = (focal length of the objective) / (focal length of the eyepiece)

= (20.0 m) / (1.9 cm)

= (2,000 cm) / (1.9 cm)

= 1,053 (rounded)