Question

A patient can't see objects closer than 32 cm and wishes to clearlysee objects that are20.4 cm from his eye.

(a) Is the patient nearsighted or farsighted?

1

farsighted nearsighted

(b) If the eye-lens distance is 1.92cm, what is the minimum objectdistance p from thelens?
2 cm

(c) What image position with respect to the lens will allowthepatient to see the object?
3 cm

(d) Is the image real or virtual? Is theimage distance qpositive or negative?

4

realimage distance is negative distanceis positive virtual image

(e) Calculate the required focal length.
5 cm

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

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

p	=	7 cm
q	=	8 cm
f	=	9 cm
P	=	10 diopters