A far sighted person cannot focus distinctly on objects closer than 1m. What is the power of lens that will permit him to read from a distance of 40 cm?
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0
Answer:
this defect is known as hypermetropia,convex lens is used for this defect
Answered by
1
Answer:1.510
Explanation:object distance (u)=-40cm
Image distance(v)=-100cm
From formula,
1/f=(1/v)-(1/u)
1/f = 1/-100 - 1/-40
1/f = -2+5/200
1/f = 3/200
f= 66.67cm
1/f = power = 1/0.66(in m)
= 1.510
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