Refractive index = speed of light in a vacuum/speed of light in medium
Refractive index is a ratio, so it has no units.
Power = 1/focal length
Power is in dioptres (D) and focal length is in metres (m).
Curvature = 1/radius of curvature
The amount of curvature a lens adds to a wave is 1/f, which is just the power of the lens.
1/v = 1/u + 1/f where v is the distance from the lens to the image, u is the distance from the object to the lens, and f is the focal length.
v, u, and f have to be in metres (m).
Magnification = size of image/size of object
Magnification is a ratio so it has no units.
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