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CBSE Class 10 Answered

Near point of a hypermetropic person is 60 cm.What is the power of the lens required to enable the person to read clearly a book placed at 30cm.
Asked by Jaymin24modi | 26 Sep, 2019, 01:34: PM
answered-by-expert Expert Answer
To treat hypermetropic eye, convex lens is used to focus the object kept at 30 cm to the point 60 cm ,
which is ner point of this case.
 
we have lens equation :- (1/v) - (1/u) = 1/f
 
v = lens-to-image distance = -60 cm
u = lens-to-object distance = -30 cm
(Cartesian Sign convention is used for u and v )
 
by substituting values for u and v in lens equation we get ,  1/f = -(1/60)+(1/30)  or f = 60 cm
 
Lens to be used is a convex lens of focal length 60cm
 
power of the lens = 1/0.6 = +1.67 D
Answered by Thiyagarajan K | 26 Sep, 2019, 03:13: PM

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