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Chapter 26: Q13CQ (page 955)
Propose a way to study the function of the rods alone, given they can sense light about 1000 times dimmer than the cones.
When we reduce light, the effect of the rod cells will increase in our vision.
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Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
People who do very detailed work close up, such as jewellers, often can see objects clearly at much closer distance than the normal 25 cm.
(a) What is the power of the eyes of a woman who can see an object clearly at a distance of only 8.00 cm?
(b) What is the size of an image of an 1.00 mm object, such as lettering inside a ring, held at this distance?
(c) What would the size of the image be if the object were held at the normal 25.0 cm distance?
A boy has a near point of 50 cm and a far point of 500 cm. Will a 鈥�4.00 D lens correct his far point to infinity?
The power of a physician鈥檚 eyes is 53.0 D while examining a patient. How far from her eyes is the feature being examined?
Repeat the previous problem for glasses that are 2.20 cm from the eyes.
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
What is the far point of a person whose eyes have a relaxed power of 50.5 D?
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