Which one of the following expressions gives the magnifying power of a refracting…

PHYSICS · Single correct · A Level · Physics · Astrophysics · Astrophysics

Problem

Which one of the following expressions gives the magnifying power

M

of a refracting telescope when the final image is at infinity? (a)

M=1+\dfrac{f_o}{f_e}

(b)

M=\dfrac{f_o}{f_e}

(c)

M=-\dfrac{f_o}{f_e}

(d)

M=-\dfrac{f_e}{f_o}