to determine the focal length of a convex mirror.
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm
The distance from the centre of the lens to the focal point.
its focal lenght becomes 2f
It is called the focal length. It is equal to 1/2 times r, and is positive on concave mirrors and negative on convex mirrors.
because manifying power has inerse relation with that of focal length
The focal length of a convex mirror is half of its radius of curvature.
1.0 diopters
no change
When the object length is less than the focal length
The focal length of a lens is the distance from the center of the lens to the point at which it focuses light rays. The bigger the focal length, the more powerful the lens. ChaCha!
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light.
Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.