Thin lens formula

The thin lens formula relates the distances of an object and its image in a lens system. It is expressed as \( \frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i} \), where \( f \) is the focal length of the lens, \( d_o \) is the distance from the object to the lens, and \( d_i \) is the distance from the lens to the image. This formula helps determine how lenses focus light, allowing us to understand and design optical devices like cameras and glasses. Essentially, it describes how light bends as it passes through a lens.