Questions
A person can see clearly only upto a distance of 30 cm. He wants to read a book placed at a distance of 50 cm from his eyes. What is the power of the lens he requires for his spectacles?
a
+2.67 D
b
-1.33 D
c
+2.5 D
d
-2.5 D
detailed solution
Correct option is B
object distance u=−50 cmImage distance V=−30 cm∴ 1f=1v−1u=1−30−1−50=201500=−175⇒Power=100−75=−1.33 DTalk to our academic expert!
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