1.A mother sees that her child’s prescription for glasses is 0.2 D. Assume the l
ID: 1369878 • Letter: 1
Question
1.A mother sees that her child’s prescription for glasses is 0.2 D. Assume the lenses are held 1 cm away from the eye by the frames. What is the child’s near point in cm?
Enter a number with 3 significant digits.
2.A very myopic man has a far point of 46.3 cm. What power contact lens (when on the eye) will correct his distant vision? Take the lens-to-retina distance to be 2.00 cm.
Enter a number wit 3 significant figures.
3. Calculate the power of the eye when viewing an object a distance 0.351 m in front of the eye. Take the lens-to-retina distance to be 2.00 cm. Enter a number with 4 significant figures.
Explanation / Answer
1)D=1/f
0.2=1/f
f=5m,near point is 24cm
2)1/f=1/do-1/di
do=23cm
1/f=1/23-1/44.3=0.04347-0.022573=0.02089
f=47.86979cm,f=0.47869m
power of lens D=1/f=2.08903diopters
3)1/f=1/23cm-1/0.331=4.347826-3.021148=1.326678
f=0.75376m
D=1/f=1.32668 diopters
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.