A hunter can't clearly see anything that lies farther than 37.6 cm from her eye. Suppose that she pursues contact lenses to compensate for her nearsightedness. (a) What power (in diopters) would be required of the contact lens in order to bring very distant objects to a focus?

When the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focal length, how close must an object be to form sharply focused images on the retina? (Note: this distance is called the near point of vision.)

is: On H 5 T Key Idea Stock of Data Solution Sanity Check 7. For a converging lens with a focal length of 12 cm viewing an object at a distance of 6 cm. Where is the image located? Physics-Problem Solving Entries Key Idea Stock of Data Solution Sanity Check Accessibility: Good to go Q Search F6 F7 & 6 7 Y U F8 * 0 8 8 11 1 F9 F10 9 O O O F11 ) 0 P F12 H Prt

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 in D of the eyes of a woman who can see an object clearly at a distance of only 7.30 cm? (Assume the lens-to-retina distance is 2.00 cm.)  ____D (b) What is the size in mm of an image of a 6.00 mm object, such as lettering inside a ring, held at this distance? (Include the sign of the value in your answer.)  ______mm (c) What would the size of the image be in mm if the object were held at the normal 25.0 cm distance? (Include the sign of the value in your answer.)  _____mm

Use the worked example above to help you solve this problem. The near point of a patients eye is 50.0 cm. (a) What focal length must a corrective lens have to enable the eye to see clearly an object 28.5 cm away? Neglect the eye-lens distance. 50 x cm (b) What is the power of this lens? 2 diopters (c) Repeat part (b), taking into account the fact that, for typical eyeglasses, the corrective lens is 2.00 cm in front of the eye. 2.26 X diopters

Where is the near point of an eye for which a contact lens with a power of 2.60 diopters is prescribed? (Assume that near point for an average viewer is 25  cm .) Where is the far point of an eye for which a contact lens with a power of -1.20 diopters is prescribed for distant vision?

A near-sighted man can only focus on distances of dfar = 5.66 m or closer. What power lenses does he need in his glasses for distance vision? Your answer should be in diopters (m-1).

(part 1 of 3) A person with a nearsighted eye has near and far points of 10 cm and 23 cm, respectively. Assuming a lens is placed 2.7 cm from the eye, what power must the lens have to correct this condition? Answer in units of diopter. (part 2 of 3) Contact lenses placed directly on the cornea are used to correct the eye. What is the power of the lens required in this case? Answer in units of diopter. (part 3 of 3) 1 What is the new near point? Answer in units of cm.

During LASIK eye surgery (laser - assisted in situ keratomileusis), the shape of the cornea is modified by vaporizing some of its material. If the surgery is performed to correct for nearsightedness, how does the cornea need to be reshaped?

A nearsighted person has a far point of 25.3cm and is prescribed contact lenses to correct her vision. What lens strength (a.k.a., lens power), in Diopters, should be prescribed? Give your answer using the usual convention of positive values for converging lenses and negative values for diverging lenses.