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Question

Calculate the focal length of a reading glass of a person if this distance of distinct vision is 75 cm.



Your Answer
A

75.2 cm

Your Answer
B

25.6 cm

Your Answer
C

100.4 cm

Correct Answer
D

37.5 cm


Solution

The correct option is D

37.5 cm


u = -25 cm

v = -75 cm

1f=1u+1v1f=125175=275f=752=37.5 cm

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