AT&T; LTE 1:04 AM 0 usq45tx.theexpertta.comC Problem Set 11 Vol 3 Ch2-Geometric

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AT&T; LTE 1:04 AM 0 usq45tx.theexpertta.comC Problem Set 11 Vol 3 Ch2-Geometric Optics Begin Date: 4/20/2017 12:00:00 AM- Due Date: 1130/2017 11:59:00 PM End Date: 12/15/2017 11:59:00 PM Nfocal eyeplasses te conect these vision peoblems. The glasses will si a distance d-1.9on hom the ee 25% Part (a) Write a formula for the power, P/, of the upper portion of the bifocals. in terms of the given quantities, that will enable the person to see distant objects clearly 25% Part (b) Calculate the power, P1, of the upper portion of the bifocals in units of diopters - 25% Part (c) Write a formula for the power, P., 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. - 25% Part (d) Calculate the power, P2, of the lower portion of the bifocals in units of diopters. Use N= 25 cm, which is for normal human vision. All colent 2017 Expert TA

Explanation / Answer

(a) To see distant objects clearly, objects at infinity have to be focussed at the far point of the eye so that the eye can then focus them on retina

P1=1/f1= 1/do+1/di= 1/infinity+ 1/(d-FP) = 1/(d-FP)

(b) P1= 1/(d-FP) = 1/(0.019-1.5)= - 0.6752 D

(c)to see an object at a distance N( closer to the eye than its near point) clearly, the objecthas to be focussed at the near point of eye so that image focus ob retina

P2= 1/f2= 1/do+1/di=1/(N-d)+1/(d-NP)

(D) P2= 1/(0.25-0.019)+1/(0.019-0.6)= +2.74 D

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