NEET Physics Practice Exam

The thin lens equation is represented as 1/f = 1/f₁ + 1/f₂, where f is the focal length of the lens, f₁ is the focal length of the object side, and f₂ is the focal length of the image side. This formula illustrates the relationship between the focal lengths of a lens and the distances of the object and image from the lens.

This equation is derived from the principles of geometric optics and describes how lenses alter the paths of rays of light. For thin lenses, which are lenses with negligible thickness compared to their focal lengths, this equation holds true under the assumption that the lens surfaces are spherical and that the object and image distances are measured from the lens itself.

In practical applications, this equation is crucial for understanding how different configurations of lenses work in optical systems, such as cameras, glasses, and microscopes. It allows for the calculation of the resulting focal length when combining multiple lenses, which is essential for designing complex optical devices.