Answer to Question #162606 in Optics for Lenovo

Question

Explain the essential features of a refracting telescope. Define and deduce an expression for the magnifying power of this instrument.

Answer 1

Answer

Magnifying power of telescope is the ratio of the angle $\alpha$ subtended at the eye by the final imege to angle $\beta$ which the object subtends at the lenses.

$m=\frac{\beta}{\alpha}=\frac{h}{f_e}\frac{f_o}{h}\\m=\frac{f_o}{f_e}$