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?
A
u/f - f
B
u/v + f
C
v/f + 1
D
v/f - 1
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Magnification, M = v/u = v (1/u)
And for the Lens formula 1/u + 1/v = 1/f
=> 1/u = 1/f - 1/v
∴M = V(1/u)
= V(1/f - 1/v) = v/f - v/v = v/f - 1
∴M = v/f - 1
Source: Myschool Past Questions Archive (Record #12918)