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Ch 19 8. A nearsighted person has glasses with a prescription of -6.25 D. What is the...

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Physics

Ch 19

8. A nearsighted person has glasses with a prescription of -6.25D. What is the farthest he can see clearly without correctivelenses (far-point)? 16 cm

9. A farsighted person has a near-point of 75 cm. Whatprescription should his glasses have to bring his near-point to 25cm? 2.67 D

10. A person with a far point of only 25 cm wants glasses thathe can wear while using a computer monitor 65 cm away from hiseyes. What refractive power do these glasses require? -2.46 D

11. A 2 cm tall object is projected as a 8 cm tall realimage.

a) What is the focal length of the lens if the object is 5 cmfrom the lens? 4 cm

b) Is the lens convex or concave? Convex

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