a) What power of lens is needed to correct the vision of a short-sighted person whose far point Is 29.0 cm? Assume the spectacle lens is held 1.70 cm away from the eye. Short poml 29.0cm Far point e9.0cm Ihe syeelade lenzmuxt placeal incregse 29-1.7=27.3 cim do s o di s 27.3 --3.70 do 273 az73 b) What power glasses lens is needed to allow a long-sighted person, whose near point is 0.90 m, to see an object clearly that is 25.0 cm away? Assume the glasses lens is held
a) What power of lens is needed to correct the vision of a short-sighted person whose far point Is 29.0 cm? Assume the spectacle lens is held 1.70 cm away from the eye. Short poml 29.0cm Far point e9.0cm Ihe syeelade lenzmuxt placeal incregse 29-1.7=27.3 cim do s o di s 27.3 --3.70 do 273 az73 b) What power glasses lens is needed to allow a long-sighted person, whose near point is 0.90 m, to see an object clearly that is 25.0 cm away? Assume the glasses lens is held
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Transcribed Image Text:* a) What power of lens is needed to correct the vision of a short-sighted person whose far point
IS 29.0 cm? Assume the spectacle lens is held 1.70 cm away from the eye.
Short pomf 29.0 cm.
Far point e9i0 cm
The syeelade lenz muxt placeal incregse
29-1.7=77.3 eim
do so0
dis27.3
T.
=-3.70
ナ
do
di
2ろ3
az73
b) What power glasses lens is needed to allow a long-sighted person, whose near point is
0.90 m, to see an object clearly that is 25.0 cm away? Assume the glasses lens is held
1.70 cm away from the eye.
near point 0.90 cm
objael= 25.0 cm away a0.25 M
slasses lons= 170= 0:01FM
di =0,9-0.017=0.883n
P= - G-1.13=2,87
0.25
0:05
c) Explain how the required powers of lenses in the examples above are affected if contacted
lenses are worn instead of glasses.
if the confeet Lorgth is
a
29
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