If we think of the cornea and the lens separately, then we can use the equation for two close proximity, thin lenses to calculate the total optical power of the eye.
1/fₜₒₜ=1/f₁+1/f₂
If the focal length of the cornea is approximately 2.5 cm and the lens part of the eye is in its relaxed state with a focal length of 10 cm, what is the total focal length of the relaxed eye?