Your optometrist prescribes contact lenses that have a focal length of 50.0 cm. (a) Are you nearsighted or farsighted? O nearsighted O farsighted (b) If your contact lenses are designed so that your near point while wearing your contacts is 36.0 cm, determine your unaided eye's near point. cm

Where would you need to place an object to make its image appear 17.22 cm away. From a Lens if the lens has a focal length of 3.05 cm?

An optometrist determines that a patient cannot clearly see any object that lies closer than 54.8 cm to the patient's eye. (a) Which of the following terms best describes this distance? O near point O magnification O far point O focal length (b) The patient needs to be able to clearly see objects that are just 27.0 cm distant. A contact lens is called for. What focal length (in cm) should this lens have? Assume the lens can be modeled as an ideal thin lens, which lies adjacent to the eye. cm (c) What is the power, P, of the contact lens (in diopters)? diopters

A person sees clearly wearing eyeglasses that have a power of  −2.00 diopters  when the lenses are 2.30 cm in front of the eyes. (a) What is the focal length of the lens? cm(b) Is the person nearsighted or farsighted? nearsightedfarsighted     (c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed? diopters