Question

Which of the following is the correct Thin Lens Formula?

Options

• \[\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\]

• \[\frac{1}{u}-\frac{1}{v}=\frac{1}{f}\]

• \[\frac{1}{f}=\frac{1}{u}\times\frac{1}{v}\]

• \[\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\]

Answer 1

The Thin Lens Formula is \[\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\], where u is the object distance, v is the image distance, and f is the focal length. It follows from combining the refraction equations at the two surfaces of a thin lens.