An astromical telescope has an angular magnification of magnitude 5 for distant objects. 36cm and the final image is formed at infinity. Determine the focal length of objective and eye piece.

An astromical telescope has an angular magnification of magnitude 5 fo

1.	An astromical telescope has an angular magnification of magnitude 5 for distant objects. 36cm and the final image is formed at infinity. Determine the focal length of objective and eye piece.
Answer» SOLUTION :For final IMAGE at infinity `M_infty=f_0/f_e and L_infty=f_0+f_e therefore 5=f_0/f_e`……(i) and `36=f_0+f_e`…….(II) Solving these two EQUATIONS, we have `f_0=30cm and f_e=6cm`