Question 2
The focal length of the lens in your eye is about 0.015 m. If the
object is 1 m from your eye, where is the image produced?

The answer would be a) -80of

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other