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Question
A doctor advise a patient to are spectating with a convex len of focal length 40 cm in constant with ·a concave lens of focal length 25 cm. What is the power of the combination?
Options
– 6.5 D
– 1.5 D
6.5 D
1.5 D
MCQ
Solution
– 1.5 D
Explanation:
`1/F = 1/F_1 + 1/F_2`
= `1/40 - 1/25`
= `(5 - 8)/200`
= `(-3)/200`
P = `100/F`
= `(100(-3))/200`
= – 1.5 D
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