Question

The magnification of a magnifying lens of focal length 5 cm is : (final image is at $\infty$)

• A. 1
• B. 2
• C. 3
• D. 5

Answer 1

Answer: (D)

5

if the final image at infinity it means the the object is at focus.
angular magnification MA$=\frac{D}{f}=\frac{25}{f}=\frac{25}{5}=5$