If the focal length of objective lens is increased then magnifying power of

Options

A. Microscope and telescope both will decrease
B. Microscope will decrease but that of telescope will increase
C. Microscope will increase but that of telescope decrease
D. Microscope and telescope both will increase

Answer

B

Explanation

`(m)_("microscope") = (L)/(f_(0) (1 + (D)/(f_(e)) ) `
`(m)_("telescope" = (f_(0))/(f_(e)) (1 + (f_(e))/(D))`.