question_answer

The near vision of an average person is 25cm. To view an object with an angular magnification of 10, what should be the power of the microscope?

Answer:

            40 D Given, d = 25 cm, m = 10 Angular magnification, \[m=\frac{d}{f}\] \[\therefore \]      \[f=\frac{d}{m}=\frac{25}{10}=2.5\,\,\text{cm}\] But       \[P=\frac{1}{f}\] So,       \[P=\frac{100}{2.5}=+\,\,40\,\,\text{D}\]