See diagram. does the eye objects at different distances into focus? The shape of the lens can change (by contracting and relaxing the cilary muscles). This causes the focal length (and the power) of the lens to change; this needs to adjust on the basis of whether the person is looking at something up close or something far away. the power of the contact lens required to correct the person’s short-sightedness. PTotal = P1 + P2 Pcorrected = Pdefective + Pcorrective eye eye lens 60 = 65 + P2 P2 = - 5 m {the negative sign indicates that it is a concave or diverging lens} Calculate the focal length of the contact lens required to correct the person’s short-sightedness.  f = 0.2 m {notice that the negative sign has no mathematical significance and so can be ignored here}
See diagram. does the eye objects at different distances into focus? The shape of the lens can change (by contracting and relaxing the cilary muscles). This causes the focal length (and the power) of the lens to change; this needs to adjust on the basis of whether the person is looking at something up close or something far away. the power of the contact lens required to correct the person’s short-sightedness. PTotal = P1 + P2 Pcorrected eye = Pdefective eye + Pcorrective lens 60 = 65 + P2 P2 = - 5 m {the negative sign indicates that it is a concave or diverging lens} Calculate the focal length of the contact lens required to correct the person’s short-sightedness.  f = 0.2 m {notice that the negative sign has no mathematical significance and so can be ignored here}
1.%20Geometrical%20Optics.docx