PHYSICS Q: Without glasses a man can see objects clearly if they are no closer than...
PHYSICS Q:
Without glasses a man can see objects clearly if they are no closer than 1.8 meters from his eyes. He walks into London Drugs and tries out some glasses there that have a power of +2.3 diopters. If he wears these glasses 1cm from his eyes, what is the shortest distance from his eyes at which he can see objects clearly?
Homework Answers
Let us assume the shortest distance is d from the lens,
using lens formula,
1/-u + 1/v = 1/f = P
1/d + 1/-(1.80-0.01) = 2.3
1/d - 1/1.79 = 2.3
d =0.35 m = 35 cm
shortest distance from eyes = 35 cm + 1 cm = 36 cm answer
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