Question

In a simple microscope, if the final image is located at infinity then its magnifying power is

Answer 1

Correct option is A. $$\displaystyle\frac{25}{f}$$

Given, in a simple microscope, the final image is formed at the infinity.

We know, least distancefor distinct vision in simple microscope is $$D=25cm$$.

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, magnifying power of the microscope is

$$m=\dfrac{D}{f}=\dfrac{25}{f}$$

So, the correct option is (A).