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Doctor has presecribed a lens having pow...

Doctor has presecribed a lens having power + 1.5D. What will be the focal length of the lens ? What is the type of the lens and what must be the defect of vision ?

Text Solution

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Frocal length of the lens ` f = 1/P 1/( 1.5D)`
` = 10/15 m = 0.6667 m = 0.67 m`
P is positive . This shows that the lens is convex. The defect of vision of farsightedness ( hypermetropia).
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