Can you plz help me please

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

It is really hard for me right know

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank