Question

A patient can't see objects closer than 35.2 cm and wishes to clearly see objects that are 20.0 cm from his eye.(

a) Is the patient nearsighted or farsighted?

(b) If the eye–lens distance is 1.99 cm, what is the minimum object distance p from the lens? (Give your answer to at least three significant digits.)
____ cm

(c) What image position with respect to the lens will allow the patient to see the object? (Give your answer to at least three significant digits.)
______cm

(d) Is the image real or virtual? Is the image distance q positive or negative? (Select all that apply.)

(e) Calculate the required focal length.
cm

(f) Find the power of the lens in diopters.
_____diopters

(g) If a contact lens is to be prescribed instead, find p, q, and f, and the power of the lens.

p	=	cm	(Give your answer to at least three significant digits.)
q	=	cm	(Give your answer to at least three significant digits.)
f	=	cm
P	=	diopters

3.

–/16 POINTSSERCP11 25.2.P.012.

MY NOTES

ASK YOUR TEACHER

A certain child's near point is 11.0 cm; her far point (with eyes relaxed) is 123 cm. Each eye lens is 2.00 cm from the retina.(a) Between what limits, measured in diopters, does the power of this lens–cornea combination vary?

lower bound	diopters
upper bound	diopters

(b) Calculate the power of the eyeglass lens the child should use for relaxed distance vision.
diopters

Is the lens converging or diverging?

convergingdiverging    

Answer 1