The Lens Equation
- The following is the lens equation that relates the object distance (u), image distance (v) and the focal length.
- When using the lens equation to solve problem, it's important to note the positive negative sign of u, v and f.
- Table below give the conventional symbol and sign for u, v and f.
Positif
|
Negatif
|
|
u
|
Real object
|
Virtual object
|
v
|
Real image
|
Virtual image
|
f
|
Convex lens
|
Concave lens
|