Question

In a simple microscope, if the final image is located at infinity then its magnifying power is; ($D$ is the least distance for distinct vision in the simple microscope)

• A. $D/F$
• B. $1$
• C. $F/D$
• D. $(1+D)/F$

Answer 1

The correct option is A $D/F$

Given: in a simple microscope, the final image is formed at the infinity.
We know that, least distance for distinct vision in the simple microscope is $D=25\text{cm}$.
Again we know, when the final image in a simple microscope is formed at infinity, the object must be situated at the focus $F$.
$\therefore$ When the image is at infinity, the magnifying power of the microscope is
$M=\frac{D}{F}$
So, the correct option is (A).