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Answer :
Answer:
A. Power of lens = 2.60
B. focal length = 17.4cm
Explanation:
A. focal length = 38.5cm
= 38.5 / 100
= 0.385m
= 385 / 1000 m
From the formula of power of lens:
Power of lens = 1 / focal length (in metre)
Power of lens = 1 / (385/1000)
Power of lens = 1000 / 385
Power of lens = 2.5974 diopter
Power of lens = 2.60 to the nearest tenth
B. Power of lens = 1 / focal length (in metre)
focal length (in metre) = 1 / power of lens
Given power of lens = - 5.75 D
Then;
focal length (in metre) = 1 / -5.75
focal length (in metre) = - 0.173913m
Therefore, the focal length = - 17.3913cm =
- 17.4cm to the nearest tenth.
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