If u is the object distance and v the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?
- u/f - f
- u/v + f
- v/f + 1
-
v/f - 1
The correct answer is: D
Explanation
Magnification, M = v/u = v (1/u)And for the Lens formula 1/u + 1/v = 1/f
=> 1/u = 1/f - 1/v
âīM = V(1/u)
= V(1/f - 1/v) = v/f - v/v = v/f - 1
âīM = v/f - 1