While the equations for mirrors and lenses are the same the

While the equations for mirrors and lenses are the same, the interpretations of the results can be different. What is different for lens calculations compared to mirror calculations?

Solution

he main difference between mirror and lens is that a mirror works by reflecting light, whereas a lens works by refracting

For a converging lens (for example a convex lens), the focal length is positive, and is the distance at which a beam of collimated light will be focused to a single spot. For a diverging lens (for example a concave lens), the focal length is negative, and is the distance to the point from which a collimated beam appears to be diverging after passing through the lens.

for convex mirror the focal length is negative, anf for concave mirror the focal length is positive.