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Question
a doctor has prescribed a corrective lens of power 1.5 D , find its focal length. is the lens diverging or converging ?
a doctor has prescribed a corrective lens of power 1.5 D , find its focal length. is the lens diverging or converging ?
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Solution
Given power, P = 1.5 D
Since, P is positive the lens is a convex lens or a converging lens.
Now, f = 1/P = 1/1.5 m
=> f = 100/1.5 cm
=> f = 66.67 cm
Given power, P = 1.5 D
Since, P is positive the lens is a convex lens or a converging lens.
Now, f = 1/P = 1/1.5 m
=> f = 100/1.5 cm
=> f = 66.67 cm
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