1.

Doctor has prescribed a lens having power +2 D. What will be the focal length of the lens ?What is the type of the lens and what must be the defect of vision ?

Answer»

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Solution :Data : `P=+2 D, F=?`
FOCAL LENGTH of the lens `f=1/P =(1)/(2 D)``= 0.5 m`
P is POSITIVE . This shows that the lens is CONVEX. The defect of vision is farsightedness (hypermetropia).


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