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

Options

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

Answer

D

Explanation

Magnifying power of microscope `=(LD)/(f_(0)f_(e))`
`:.` As `f_(0)` increases, magnifying power decrease hile magnifying power of telescope `=(f_(0))/(f_(e))`
`:.` As `f_(0)` ncrease, magnifying power increases.