A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect?
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Explanation:
The person needs a concave lens to rectify this defect.
Calculation of power of the lens:
Here, far point of myopic eye = 2 m
The object kept at infinity can be seen clearly if the image of this object is formed at 2 m.
So, object distance, u = ∞
Image distance, v = 2 m
1/v – 1/u = 1/f
1/-2 – 1/∞ = 1/f
f = - 2m
p = 1/f = 1/-2 = -0.5D