ANSWER ONLY IF YOU ARE SURE.....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question

ANSWER ONLY IF YOU ARE SURE.....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

A person has a near point of NP = 75 cm and a far point of FP = 195 cm. The person wishes to obtain a pair of bifocal eyeglasses to correct these vision problems. The glasses will sit a distance d = 1.6 cm from the eyes. Write a formula for the power, P_I, of the upper portion of the bifocals, in terms of the given quantities, that will enable the person to see distant objects clearly. Calculate the power, P_I, of the upper portion of the bifocals in units of diopters. Write a formula for the power, P_2, of the lower portion of the bifocals, in terms of given quantities, so that the person can clearly see objects that are located a distance N from his eyes. Calculate the power, P_2, of the lower portion of the bifocals in units of diopters. Use N= 25 cm, which is for normal human vision.

Explanation / Answer

you have already got correct answers for a and b ,so i answered from c

C)

Image distance

di=-(NP-N)

object distance

do=N-d

P2=1/(N-d) - 1/(NP-d)

d)

P2=1/(25-1.6) -1/(75-1.6)

P2=2.9 diopters

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