3. 0/14.28 points | Previous Answers SerCP9 23.P.008. My Notes Ask Your Teacher

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3. 0/14.28 points | Previous Answers SerCP9 23.P.008. My Notes Ask Your Teacher To fit a contact lens to a patient's eye, a keratometer can be used to measure the curvature of the cornea-the front surface of the eye. This instrument places an illuminated object of known size at a known distance p from the cornea, which then reflects some light from the object, forming an image of it. The magnification M of the image is measured by using a small viewing telescope that allows a comparison of the image formed by the cornea with a second calibrated image projected into the field of view by a prism arrangement. Determine the radius of curvature of the cornea when p = 25.0 cm and M = 0.0150 0.0761 l: (a i.liries: is off by a multiple of ten. mm Need Help? Talk to a Tutor Submit Answer Save Progress Practice Another Version

Explanation / Answer

We use the lens eqn 1/s + 1/s' = 2/R and M = -s'/s...Here s = 25.0cm

So s' = -M*s = -0.015*25.0cm = -0.375cm

Now 2/R = (1/25 + 1/(-0.375))===> R= -0.761

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